GM Performance Parts - Crate Engines

CRATE PERFORMANCE ENGINES

10185077 HO 350 Camaro Conversion
This ZZ4 engine conversion kit for 1983-87 Camaro vehicle is no longer available.
The following information is for those customers who purchased a kit and require service parts.

Chevrolet engineers have developed an emission-legal conversion kit to install a High Output 5.7-liter (350ci) small-block V8 in a 1982-87 Camaro originally equipped with an LG4 or L69 305ci V8 engine and a 700R4 automatic transmission. This coordinated package of components significantly improves vehicle performance while retaining all required emission controls.

Performance: During development of the HO 350 Camaro conversion, a prototype HO 350 engine equipped with a computer-controlled Quadrajet carburetor and all emission controls required for this application, produced 308 horsepower (at 5000 rpm) and 365 lb-ft torque (at 3500 rpm). The Chevrolet Raceshop's 1987 Camaro test vehicle equipped with an emission-legal HO 350 ran a quarter-mile elapse time of 13.83 seconds at 98 mph.

Certification: When all components are installed as specified in the instruction manual, the HO 350 conversion meets emission requirements under EPA Memorandum 1A for operation in 49 states (excluding California). The conversion is also legal for sale and use in California under California Resources Board Exemption Order #D-278. Note the entire HO 350 conversion package must be installed exactly as described in the manual to comply with emission regulations. Also note that this conversion is certified only for the specific year models, engines, and transmissions listed above.

Installation: The HO 350 conversion is designed for "do-it-yourself" installation. A comprehensive instruction manual is included. Minor welding is required to install the exhaust system. The HO 350 Camaro conversion is a coordinated package of components that work together to improve vehicle performance. Major assemblies include: Engine: The heart of the Camaro conversion is the HO 350 Chevrolet small-block V8 (P/N 24502609). High performance engine assembly has been updated with new hydraulic roller camshaft profile, a low-profile dual-pattern intake manifold, revised valvetrain components, and other improvements.

Air Cleaner: The HO 350 Camaro breathes through a dual-snorkel air cleaner. A "ram air" system channels cool air to the carburetor through flexible air ducts. Fuel Pump: A high-volume in-tank electric pump meets HO engine's fuel requirements. The pump kit includes vent lines, a sending unit, and a wiring harness. An adjustable external regulator controls fuel pressure.

Exhaust System: The HO 350 conversion package includes a low-restriction exhaust system with dual catalytic converters, high-flow exhaust manifolds with 2 1/4" outlets, a single 3" diameter tailpipe, and a transverse muffler.

Calibration: The kit includes an engine control module (ECM), specially programmed PROM chips, a coolant fan switch, an electric spark control (ESC) module, and Quadrajet secondary metering rods.

Transmission: A pressure regulator spring, boost valve, and servo assembly improve the 700R4 automatic transmission's shift firmness.

Rear Control Arms: Rear axle control arms with high-durometer (50K) bushings reduce wheel hop under hard acceleration.

Technical Notes: Chart on following page. Installation and Service Manual P/N 12485074.

12363230 HT 3.4
Tired of that tired 2.8 V6 in your S-truck? It's time for a major upgrade, GM Performance Parts style. The HT 3.4 is a bolt in replacement for the 2.8 V6 in your 1982 - 1985 S-10 pickup or Blazer with automatic transmission. And it's emission legal in 49 states (Yes, you guessed it, California said no.) But for the rest of us, the HT 3.4 is the best thing going. With 160 horsepower and 194 Ft. Lbs. of torque your truck will feel better than new, and tow better than ever. The heads have large 1.72" intake and 1.42" exhaust valves and combustion chambers that yield a healthy 9 to 1 compression ratio. The camshaft is a high lift, short duration design, developed to produce lots of strong low end torque and mid range horsepower. With .427" intake and .454" exhaust lift, the cam ensures a strong pull to 5000 RPM. Doesn't sound like your 2.8 V6 at all does it? It isn't, when GM Performance Parts develops an engine we focus on making power. But not power for the sake of power, but power where you need it. For great drivability, towing performance and maybe even a little off road fun. The HT 3.4, a serious upgrade for your favorite little truck. With 40 more horsepower than your 2.8 V6, why would you even consider rebuilding that old 2.8? The induction system, ignition system, exhaust, emission controls, water pump and other parts required to bolt in your new HT 3.4 are already on your truck. Sounds like a weekend project or talk to your GM Performance Parts Authorized Center, they can install it for you.

Technical Notes: This is for engines with carburetors only, not released for TBI usage. This engine does not have a clutch boss on the side of the block for standard transmission application.

Additional Technical Information/Printable PDF

12371171 ZZ502/502 Complete Engine Kit
The king of all big block crate engines is the ZZ 502/502, with torque and horsepower that will have you grinning and streetable manners that have your competition wondering what hit them. The ZZ 502/502 represents our latest and best efforts to develop awe inspiring big block power in a dependable, durable and drivable big block crate engine.

With its big valve aluminum heads, roller camshaft and complete dyno tuned induction and ignition system, this is as close as you will come to a custom built 502 at crate engine prices. And for those that like to grind on heads, change cams, mill for compression or whatever, we've left it only partially assembled. Make no mistake, everything you need is there, but you don't need to disassemble anything to make head mods or an intake swap. It really is the best of both worlds, bolt it together and go, or tweak it to meet your specific needs. It's like someone at GM Performance Parts has been there, and we have.

The ZZ 502/502 makes extensive use of aluminum to keep weight down. Including aluminum heads, intake, water pump, and valve covers. Additionally, this king of the crate engines is full of heavy duty parts, to ensure that it will be making awesome power for a long, long time. With its forged aluminum pistons, forged shot peened steel connecting rods with 7/16" bolts, forged steel crankshaft, four bolt main block, stainless steel valves, 6 quart oil pan, and windage tray, the ZZ 502/502 seems more like a custom race engine than a crate engine. With a 5800 rpm redline it might just feel more like a custom race engine than a crate engine too.

Available as a long block kit or a complete engine kit, the ZZ 502/502 is designed to meet your needs. The base kit includes a fully assembled short block with 2.25" intake aluminum heads, valvetrain, aluminum valve covers, torsional damper and 14" automatic transmission flex plate. The complete engine kit adds an aluminum intake manifold, 850 cfm carb, complete ignition system, gear reduction starter and aluminum water pump. Both kits include hardware and gaskets for all parts included in the particular kit. Finally "some assembly required" is a good thing.

The ZZ 502/502 is not intended for marine use, and should only be used in 1976 and earlier pre- emissions street vehicles or any year off road vehicles.

Additional Technical Information/Printable PDF

12371204 ZZ 502/502 Long Block Kit
The king of all big block crate engines is the ZZ 502/502, with torque and horsepower that will have you grinning and streetable manners that have your competition wondering what hit them. The ZZ 502/502 represents our latest and best efforts to develop awe inspiring big block power in a dependable, durable and drivable big block crate engine.

With its big valve aluminum heads, roller camshaft and complete dyno tuned induction and ignition system, this is as close as you will come to a custom built 502 at crate engine prices. And for those that like to grind on heads, change cams, mill for compression or whatever, we've left it only partially assembled. Make no mistake, everything you need is there, but you don't need to disassemble anything to make head modifications or an intake swap. It really is the best of both worlds, bolt it together and go, or tweak it to meet your specific needs. It's like someone at GM Performance Parts has been there, and we have.

The ZZ 502/502 is not intended for marine use, and should only be used in 1976 and earlier pre-emissions street vehicles or any year off road vehicles.

12486041 350 HO
Our lowest priced crate engine, the 330 horsepower 350 HO doesn't sacrifice power or durability, it just pumps up the value. With its four bolt main block, nodular iron crankshaft, PM steel connecting rods and light but strong cast aluminum pistons, this engine screams durability. Add to the strong foundation a pair of 64cc Vortec cast iron cylinder heads and a dual pattern camshaft with just a bit of a "lumpy" idle, and you've got the muscle car small block that you've been looking for. Dressed to impress with chrome valve covers and timing cover, this engine will look great between the fenders of your favorite street rod, muscle car or grass roots racer. The cylinder heads on this great little performer use 1.94" intake and 1.50" exhaust valves that are sprung with 1999 Corvette L3I valve springs. The 64cc chambers yield a healthy, but streetable 9.1 to 1 compression ratio. The cam is a modern dual pattern interpretation of the old '65 to '67 Corvette 327 cam. But with more lift and duration on the exhaust side, it does a better job of clearing exhaust from the combustion chamber. We also decreased duration and lift ever so slightly on the intake side to build more cylinder pressure. The result is a cam that makes great torque and horsepower with the 350 HO's 9.1 to 1 compression ratio. Add the new dual plane intake manifold P/N 12496820, 650 cfm carburetor, HEI distributor, torsional damper, water pump and exhaust manifolds or headers and you've got an outstanding muscle motor with a broad, smooth torque curve and an honest 330 horsepower. This manifold has four bolts, not six, to attach it to the cylinder head. Older six-bolt manifolds will not fit the new Vortec heads. The 350 HO is not intended for marine use, and should only be used in 1975 and earlier pre-emissions street vehicles or any year off road vehicles.

Technical Notes: Engine ID code is CC. Requires a counterweighted flywheel or flex plate, 10105832, 14088646, 14088650, 14088765, or 12554824. See flywheel chart. Requires torsional damper 6272221 (6.75") or 12555879 (8"). Oil dipstick located on right side. 650 cfm carburetor recommended. Chrome valve covers and timing cover included. Intake manifold, distributor, flywheel, torsional damper, water pump, and exhaust manifolds are not included. Distributor P/N 1104067 or melonized distributor gear P/N 10456413 must be used on all crate engines with steel camshafts.

12495515 Ram Jet 350
You may recall the Ram Jet brand from the GM mechanical fuel injection systems of the 50's. Back then everyone wanted a "fuelie" and today that's even more true. GM Performance Parts has brought back the Ram Jet name with its all new electronic port fuel injection systems for small-block and big-block crate engines. The small-block Ram Jet 350's intake manifold is styled like the Ram Jet of yesterday, but that is where the similarity ends. The all new Ram Jet 350 uses state of the art components developed by GM to give you all of the benefits of modern electronic engine management. Who better to fuel inject your hot rod than the people who build 5 million fuel injected cars and trucks per year, including the one in your driveway. Unlike some after market systems, Ram Jet offers great cold starts, hot starts, always ideal air to fuel ratios and exceptional throttle response, power and drivability.

The all new 350 horsepower Ram Jet 350 from GM Performance Parts makes it easy to have electronic fuel injection on any 1976 or older vehicle originally equipped with a carburetor. The secret is the industry leading MEFI 3 controller. This new controller fits in the palm of your hand and was originally developed by GM Power train for marine applications. MEFI 3 is ideally suited for use in street rods, street machines and sportsman racers. Installation is simple, the Ram Jet 350 is an assembled 350 crate engine with Vortec cylinder heads, Ram Jet induction system, wiring harness, MEFI 3 controller, and detailed instructions. Once installed in the vehicle, a user needs only to supply 12V power and fuel. Please note the fuel pump recommendations in the Ram Jet instruction manual. The Ram Jet 350 has it all, great nostalgic styling, drivability unsurpassed by carburetors or after market fuel injection, power to spare and a hot rod idle that sounds like Woodward Avenue in 1969 all over again. GM Performance Parts is "More Than Just Power" and once you've driven a Ram Jet you'll understand why.

Components for this manifold are sold separately, or as kit assembly P/N 12498032.

12496769 Fast Burn 385
With more ZZZ through ZZ4 crate engines sold over the years than any other high performance crate engine, it only makes sense that GMPP would continue to improve that successful family of engines. The new Fast Burn uses the proven ZZ4 short block and ads to it the Fast Burn cylinder heads for 385 value packed horsepower. With value in mind, the Fast Burn uses stamped rocker arms and the same ZZ4 camshaft that powers thousands of hot rods. The Fast Burn is an excellent choice for the basis of a custom engine. Its strong forged steel crankshaft and forged powdered metal connecting rods have been proven to 500 horsepower. And its Fast Burn cylinder heads are hungry for a little more camshaft, approximately 425 horsepower at 6000 rpm is achievable by adding the HOT cam and 1.6 self aligning rocker arms.

Value priced small-block power, great durability, easy power upgrades. It's all that and more from the "More Than Just Power" people at GMPP.

Additional Technical Information/Printable PDF

12496962 ZZ502 Fully Assembled 502/502
America's favorite big-block crate engine is now available fully assembled. All the same great parts used in the ZZ502 kit engines, but fully assembled for easier installation in your hot rod, street rod or sportsman racer. Available in two versions, base (P/N 12496963) and deluxe (P/N 12496962). The base engine is a fully assembled long block with valve covers and valvetrain. The deluxe is a complete engine from intake manifold to pan. (Carburetor and starter included but not installed because of crating.) See the ZZ502 kit engine information for specific content and specifications.

12496963 ZZ502 Fully Assembled 502/502
America's favorite big-block crate engine is now available fully assembled. All the same great parts used in the ZZ502 kit engines, but fully assembled for easier installation in your hot rod, street rod or sportsman racer. Available in two versions, base (P/N?12496963) and deluxe (P/N?12496962). The base engine is a fully assembled long block with valve covers and valvetrain. The deluxe is a complete engine from intake manifold to pan. (Carburetor and starter included but not installed because of crating.) See the ZZ502 kit engine information for specific content and specifications.

12496968 330/350 HO Deluxe
The 350 HO Deluxe takes the value leading 350 HO a step further by adding carburetor, distributor, water pump, torsional damper, and auto trans flex plate. This enhancement to the Vortec cylinder head 330 horsepower 350 HO makes it easier than ever to repower your street rod, street machine or sportsman racer. The 600 cfm vacuum secondary Holley carburetor is ideally suited to the 350 HO. And the proven GM HEI distributor will give years of worry-free driving. With a 9.1 to 1 compression ratio, it's pump gas friendly, and with its muscle car idle it's cruise night cool. With GMPP's lowest priced small-block crate engine there is no reason to rebuild that junk yard clunker and since it's complete from carb to pan there is no need to chase parts. Talk to your GM Performance Parts Authorized Dealer about any additional required parts to complete your re-power project. This engine is perfect for your 1975 or older vehicle or any off-road usage.

Additional Technical Information/Printable PDF

12497317 HT 383
Specially tuned for torque, the all new HT 383 delivers great truck power in a small block package for your truck or street rod. With its 3.80" stroke and Vortec cylinder heads the HT 383 makes awesome torque, down low where you need it for towing or four wheeling off road. Peak torque is 435 ft.lbs at 4000 rpm, but the HT 383 makes over 400 ft.lbs. from 2500 to 4000 rpm. Developed with a roller cam, special heavy duty forged powdered metal connecting rods, "4340" forged crankshaft and hypereutectic pistons the HT 383 is designed ot be worked. 340 horsepower at 4500 rpm doesn't hurt either. The HT 383 is an ideal replacement for any 1977 and older carbureted engine or off road application.

12497323 Ram Jet 502
Ram Jet 502, you either have one or you want one. With 502 horsepower at 5100 rpm and 565 ft-lbs of torque at 3200 rpm, the instantly throttle responsive Ram Jet 502 drives like no other big-block you've ever driven. With over 500 lb. of torque from 2200 to 5200 rpm the ram Jet 502 is a tire shredding monster.

Designed for ease of installation the Ram Jet 502 needs only 12V, ground, fuel feed and fuel return to run. Included are an instruction sheet, service manual and diagnostic tool for ease of installation and service. As with any GM Performance Parts Ram Jet engine, an in tank fuel pump is recommended to avoid possible vapor lock. See the instruction sheet for fuel pump recommendations. Also included is complete throttle linkage that accepts your production throttle cable and transmission cable. Includes pre-programmed MEFI 3 ECM and wiring harness.

The Ram Jet manifold stands eleven inches tall as measured from the front and rear "china wall" on the cylinder block. That's just half an inch taller than a typical single plane high rise manifold, Holley carb and air cleaner combo.

For specific internal engine specifications refer to the ZZ502/502.

12498772 ZZ383/425 Crate Engine

With GM's legendary Fast Burn cylinder heads and 383 cubic inches, the ZZ383/425 delivers incredible torque with smooth, linear delivery. If you're looking for a small-block package that delivers big-block power, then you've found it. 425 horsepower at an incredibly low 5400 RPM, and 460 ft-lbs. of torque at 4500 RPM make this the ideal hot street engine or off road powerhouse.

The excellent air handling and combustion characteristics of the Fast Burn cylinder heads combined with the ZZ383/425's 3.800" stroke, make this engine the benchmark against which all other 383 inch small-blocks should be measured. And it's tough, too. The 4340 nitrided and induction hardened crank and unique forged PM rods see to that. The 9.1 to 1 compression ratio ensures that the ZZ383/425 is 92 octane pump gas friendly.

The ZZ383/425 gets a stout .509/.528 lift steel camshaft, with 222/230 duration at .050 lift. Hydraulic roller lifters and GM's time tested 1.5 to 1 roller rocker arms round out the valve train. And, of course, it has the Fast Burn head's lightweight stainless steel valves and retainers for reliable performance at extended RPM.

GM's testing was completed using a GM single plane intake, P/N 12496822 and a 750 CFM Demon carburetor with mechanical secondaries. Test header specs are: 1 3/4" primaries, 33 inches long with 4-inch collectors.

GM dual plane intake P/N 12366573 may be used for hood clearance on the ZZ383/425, but results in a decrease in peak horsepower of approximately 15-20 horsepower.

GM Crate Engines are horsepower rated to SAE Standards.

Technical Notes: ZZ 383/425 Technical Information
Horsepower 425 @ 5400 RPM
Torque 449 @ 4500 RPM
Max. Recommended RPM 6000
Compression Ratio 9.1:1
Partial Engine 12499106
Block 88962516 Four bolt main, cast iron
Crankshaft 12489436 Steel "4340"
Connecting Rods 12497624 PM rods
Pistons.005 O/S 12499103 High silicon aluminum
Piston Rings .005 O/S 12499107
Camshaft 12370846
Cylinder Heads 12464298
Head Gasket 10105117 (.28 thick)
Intake Valves 12555331 2.00"
Exhaust Valves 12551313 1.55"
Valve Springs 12551483
Rocker Arms 12370838 1.5:1 roller rockers kit
Tortional Damper 12498008
Flex Plate 14088765
Lifters 5232720 Flat Tappet
Spark Plugs R 44LTS or R42LTS for racing
Fuel Premium 92 octane or greater
Ignition Timing 32º total @ 3000 RPM with vacuum advance disconnected

12498777 ZZ454/440 Crate Engine

The ZZ454/440 offers tremendous value in a big-block crate engine. Based on the proven 454 HO with its Gen VI 454 block, the addition of GM Performance Parts Signature series aluminum heads reduce weight and increase horsepower to 440, up from the 454 HO's 425.

The ZZ454 shares its forged crankshaft and connecting rods with GMPP's 454 HO and the family of famous 502 crate engines, so you know it's strong. Forged pistons fill the block, and a steel roller camshaft times the valves. Complete with dual plane intake manifold, water pump, torsional damper and automatic transmission flex plate, the ZZ454 is one value packed big-block crate engine.

With its throttle responsive 9.6 to 1 compression ratio, the pump gas friendly ZZ454 is a great choice for muscle cars, bracket racers and off-road truckers. Just add your 850 CFM carb, GM HEI distributor, and 2 1/4" primary headers and you're ready to rip.

The ZZ454/440 is intended for use in 1979 and earlier pre-emission street vehicles and any year off-road vehicles.

GM Crate Engines are horsepower rated to SAE Standards.

Technical Notes:

ZZ 454/440 Technical Information
Horsepower 440 @ 5250 RPM
Torque 500 @ 3250 RPM
Max. Recommended RPM 5500 RPM
Compression Ratio 9.6:1
Block 12550307 Cast Iron - Four bolt mains
Crankshaft 14096983 Forged Steel
Connecting Rods 10198922 Forged Steel
Pistons 10215228 Forged Aluminum
Piston Ring 12523921
Camshaft 24502611 Hydraulic roller; Lift: .510" I, .540" E.; Duration @ .050: 211º I, 230º E.
Timing Chain 10114177 Single Roller
Cylinder Heads 12363390 Cast aluminum 110 cc combustion chambers
Intake Valves 12366986 2.19"
Exhaust Valves 12366988 1.88"
Rocker Arms 12368082 1.7:1
Torsional Damper 10216339 8"
Flexplate 10185034 14"
Valve Lash Net Lash
Fuel 92 Octane
Spark Plugs #4 Rapid Fire Gap .045
Ignition Timing 4º BTDC

Technical notes: For manual transmission applications use flywheel P/N 14096987 and a suitable 11" clutch assembly. Distributor P/N 93440806 or melonized distributor gear P/N 10456413 must be used on all crate engines with steel camshafts.

12498792 ZZ572/620 Base Crate Engine

The new ZZ572/620 is built around an all-new Gen VI tall deck Bow Tie big block. This all new engine is filled with a forged 4340 steel crank with 4.375 inch stroke, shot peened, forged 4340 H-beam rods, and forged aluminum pistons with full floating wrist pins. Hard core race parts for hard core long term durability!

The redesigned rectangular port aluminum cylinder heads result in a pump gas friendly 9.6 to 1 compression ratio. A hydraulic roller cam with 0.632 inch lift actuates the stainless steel valves. And, of course, hardened chromemoly retainers, roller rocker arms, and dual valve springs are used to complete the valvetrain.

This engine makes 620 horsepower at 5500 RPM and 650 ft. lbs. of torque at 4500 RPM.

Pump gas friendly, massive torque and horsepower, all from GM, the ZZ572/620 is for those who consider excess to be barely enough.

GM Crate Engines are horsepower rated to SAE Standards.

Technical Notes:

ZZ 572/620 Technical Information
Horsepower 620 @ 5500 RPM
Torque 650 Ft. Lbs. @ 4500 RPM
Max. Recommended RPM 6000 RPM
Compression Ratio 9.6:1
Partial Engine 12499190
Block 25534368 Tall Deck
Bearing Kit, Main 88962212
Bearing Kit, Camshaft 12499434
Crankshaft 88961554 Forged 4340 Steel
Connecting Rod 88962926 Forged 4340 Steel
Bearing Kit, Connecting Rod 88961556
Piston & Pin 88962925 Forged Aluminum
Piston Ring 12499212 Plasma-moly
Camshaft 88961557 Hydraulic roller
Balancer 88962814 SFI Approved
Cylinder Head 12499255 Aluminum
Gasket, Head 88961561
Rocker Covers, pare 12499200
Valve, Intake 12366987 2.25" Stainless steel
Valve, Exhaust 88963128 1.88" Stainless steel
Valve, Spring 88963934 Dual
Valve, Retainer 12366990 Chrome moly steel
Key, Valve Retainer 12366992
Key, Valve Spring 88963937
Rocker Arm 12361323 Roller 1.7:1
Lifters 17120060 Hydraulic Roller
Push Rod, Intake 88961559 High performance one piece
Push Rod, Exhaust 88961558 High performance one piece
Oil Pan 10240721
Windage Tray, Oil 88962187 Screened and louvered
Gasket, Oil Pan 10106407
Oil Pump 88963707
Spark Plug 5613878 - R45XLS

The following items are included in the ZZ 572/620 HP Deluxe Engine Package
Water Pump 14058915 Aluminum Short
Carburetor 88961560 850 CFM Demon
Flex Plate 12561217
Distributor 88961867-HEI
Manifold, Intake 88961161 Single Plane
Gasket, Intake 88962213
Wires, Spark Plugs 12499211
Ignition Timing 36º total advance
Fuel 92 Octane

12498793 ZZ572/620 Deluxe Crate Engine
The Deluxe version of the ZZ572/620 engine includes the Base ZZ572/620 engine, plus the following items: aluminum water pump, 850 CFM Demon carburetor, flex plate, HEI distributor, aluminum Intake Manifold and red plug wires and looms.

Technical Notes: Horsepower 620 @ 5500 RPM
Torque 650 Ft. Lbs. @ 4500 RPM
Max. Recommended RPM 6000 RPM
Compression Ratio 9.6:1
Partial Engine 12499190
Block 25534368 Tall Deck
Bearing Kit, Main 88962212
Bearing Kit, Camshaft 12499434
Crankshaft 88961554 Forged 4340 Steel
Connecting Rod 88962926 Forged 4340 Steel
Bearing Kit, Connecting Rod 88961556
Piston & Pin 88962925 Forged Aluminum
Piston Ring 12499212 Plasma-moly
Camshaft 88961557 Hydraulic roller
Balancer 88962814 SFI Approved
Cylinder Head 12499255 Aluminum
Gasket, Head 88961561
Rocker Covers, pair 12499200 "572"
Valve, Intake 12366987 2.25" Stainless steel
Valve, Exhaust 88963128 1.88" Stainless steel
Valve, Spring 88963934 Dual
Valve, Retainer 12366990 Chrome moly steel
Key, Valve Retainer 12366992
Shim, Valve Spring 88963937
Rocker Arm 12361323 Roller 1.7:1
Lifters 17120060 Roller
Push Rod, Intake 88961559 High performance one piece
Push Rod, Exhaust 88961558 High performance one piece
Oil Pan 10240721
Windage Tray, Oil 88962187
Gasket, Oil Pan 10106407
Oil Pump 88963707
Spark Plug 5613878 - R45XLS

12498826 ZZ572/720R Base Crate Engine
Engineered by GM Performance Parts and GM Racing exclusively for sportsman racers, the new ZZ572/720R is built around an all-new Gen VI tall deck Bow Tie big block. This all new race block is filled with a forged 4340 steel crank with 4.375 inch stroke, shot peened forged 4340 H-beam rods, and forged aluminum pistons with full floating wrist pins. Plasma moly piston rings are standard as is the screened and louvered windage tray. GM's first purpose-built drag race engine is filled with hard core race parts for hard core performance and long term durability.

The redesigned rectangular port aluminum cylinder heads result in a race gas only 12 to 1 compression ratio. A solid roller cam with 0.714 inch lift actuates the stainless steel valves. And, of course, hardened chromemoly retainers, roller rocker arms, and dual valve springs are used to complete the valve train.

This engine makes the 720 horsepower at 6250 RPM and 685 ft. lbs. of torque at 4500 RPM. Out of the crate and into your race car - it's just that simple.

Race gas fueled, high revving horsepower, all from GM, the ZZ572/720R is the engine that will get you down the track consistently, pass after pass, season after season.

GM Crate Engines are horsepower rated to SAE Standards.

Technical Notes: ZZ 572/720R Technical Information
Horsepower 720 @ 6250 RPM
Torque 685 Ft. Lbs. @ 4500 RPM
Max. Recommended RPM 6750 RPM
Compression Ratio 12:1
Partial Engine 12498825
Block 25534368 Tall Deck
Bearing Kit, Main 88962212
Bearing Kit, Camshaft 12499434
Crankshaft 88961554 Forged 4340 Steel
Connecting Rod 88962926 Forged 4340 Steel
Bearing Kit, Connecting Rod....88961556
Piston & Pin 88963227 Forged Aluminum
Piston Ring 12499212 Plasma-moly
Camshaft 88962216 Mechanical roller
Balancer 88962814 SFI Approved
Cylinder Head 88961160 Aluminum
Gasket, Head 88961561
Rocker Covers, pair 12499200 "572"
Valve, Intake 12366987 2.25" Stainless steel
Valve, Exhaust 88963128 1.88" Stainless steel
Valve, Spring 88963933 Dual
Valve, Retainer 12366990 Chrome moly steel
Key, Valve Retainer 12366992
Shim, Valve Spring 88963937
Rocker Arm 12361323 Roller 1.7:1
Lifters 88962920 Roller
Push Rod, Intake 88962284 High performance one piece
Push Rod, Exhaust 88962283 High performance one piece
Oil Pan 10240721
Windage Tray, Oil 88962187
Gasket, Oil Pan 10106407
Oil Pump 88963707
Spark Plug 5613100 - R42XLS

12498827 ZZ572/720R Deluxe Crate Engine
The Deluxe version of the ZZ572/720R starts with the Base ZZ572/720R engine and adds the new tall deck single plane intake manifold and 1090 CFM King Demon carburetor delivers enough air and fuel to make 720 hp and 685 lb-ft of torque. The Deluxe 572 also includes the dip stick, dip stick tube, water pump and Distributor.

Technical Notes: ZZ 572/720R Deluxe Technical Information
Horsepower 720 @ 6250 RPM
Torque 685 Ft. Lbs. @ 4500 RPM
Max. Recommended RPM 6750 RPM
Compression Ratio 12:1
Partial Engine 12498825
Block 25534368 Tall Deck
Bearing Kit, Main 88962212
Bearing Kit, Camshaft 12499434
Crankshaft 88961554 Forged 4340 Steel
Connecting Rod 88962926 Forged 4340 Steel
Bearing Kit, Connecting Rod 88961556
Piston & Pin 88963227 Forged Aluminum
Piston Ring 12499212 Plasma-moly
Camshaft 88962216 Mechanical roller
Balancer 88962814 SFI Approved
Cylinder Head 88961160 Aluminum
Gasket, Head 88961561
Rocker Covers, pair 12499200 "572"
Valve, Intake 12366987 2.25" Stainless steel
Valve, Exhaust 88963128 1.88" Stainless steel
Valve, Spring 88963933 Dual
Valve, Retainer 12366990 Chrome moly steel
Key, Valve Retainer 12366992
Shim, Valve Spring .88963937
Rocker Arm 12361323 Roller 1.7:1
Lifters 88962920 Roller
Push Rod, Intake 88962284 High performance one piece
Push Rod, Exhaust 88962283 High performance one piece
Oil Pan 10240721
Windage Tray, Oil 88962187
Gasket, Oil Pan 10106407
Oil Pump 88963707
Spark Plug 5613100 - R42XLS

The following items are included in the ZZ 572/7R20 HP Deluxe Engine Package
Water Pump 14058915 Aluminum Short
Carburetor 88962217 1090 CFM King Demon
Distributor 10093387 Multiple Spark Discharge
Manifold, Intake 88962218
Gasket, Intake 88962213
Wires, Spark Plugs 12499211
Ignition Timing 36º total advance
Fuel Race Fuel

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12499466 Ecotec 2.0L Supercharged Production Engine
This supercharged 4 cylinder Crate Engine (RPO LSJ) features the following:
DOHC with Sequential Fuel Injection
Bore is 86.00 mm and Stroke 86.00 mm with 9.5:1 compression ratio
205 Horsepower @ 5600 RPM and 200 lb-ft @ 4000 RPM torque
This engine powers the Saturn ION Redline
This production engine includes: exhaust manifold, intake manifold, injectors, fuel rail, balancer, water pump and flywheel

Technical Notes: Pulley, belt, p/s pump, a/c pump, starter, alternator, and engine cover are not included with this engine

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12499467 Gen III 6.0L V8 Production Engine
What a great engine to re-power your favorite car or truck. This is a quality V-8 Crate Engine "RPO LQ9" with the following features:
345 Horsepower @ 5200 RPM and 380 lb-ft @ 4000 RPM torque
Sequential fuel injection
Bore is 101.60mm and Stroke is 92.00mm with 10:1 compression ratio
Cast Iron Block, Aluminum Heads and Hydraulic roller design camshaft
This production engine powers the AWD Cadillac Escalade
This production engine includes: exhaust manifolds, intake manifold, injectors, fuel rails, balancer, water pump and flywheel
The iron block truck LQ9 engine weighs approximately 65 pounds more than a typical LS1 and LS6.

12499468 Northstar 4.6L V8 Production Engine

This V-8 Crate Engine (RPO LH2) features the following:
320 Horsepower @ 6400 RPM and 310 lb-ft @ 4400 RPM torque
Sequential fuel injection
Bore is 93.00 mm and Stroke is 84.00 mm with 10.5:1 compression ratio
Aluminum Block, Aluminum Heads, and Hydraulic roller design camshaft
This engine powers the Cadillac XLR and SRX
This production engine includes: exhaust manifolds, intake manifold, injectors, fuel rails, balancer, water pump and flywheel

Pulley, belt, p/s pump, a/c pump, starter, alternator and engine cover are not included with this engine

12499469 3800 Series II Supercharged Production Engine
This supercharged V-6 Crate Engine (RPO L67) features the following:
240 Horsepower @ 5200 RPM and 280 lb-ft @ 3600 RPM torque
Sequential fuel injection
Bore is 96.52 mm and Stroke is 86.36 mm with 8.5:1 compression ratio
Iron Block, Iron Heads and Hydraulic roller design camshaft
This engine powers the Buick Park Avenue, Chevrolet Monte Carlo
This production engine includes: exhaust manifolds, intake manifold, supercharger, injectors, fuel rails, balancer, water pump and flywheel

Technical Notes: Pulley, belt, p/s pump, a/c pump, starter, alternator and engine cover are not included with this engine

Additional Technical Information/Printable PDF

12499470 3800 Series III Supercharged Production Engine
This high output supercharged V-6 Crate Engine (RPO L32) features the following:
260 Horsepower @ 5400 RPM and 280 lb-ft @ 3600 RPM torque
Sequential fuel injection
Bore is 96.52 mm and Stroke is 86.36 mm with 8.5:1 compression ratio
Iron Block, Iron Heads and Hydraulic roller design camshaft
This engine powers the Buick Park Avenue and Regal, Pontiac Bonneville and Grand Prix, Chevrolet Monte Carlo, and Chevrolet Impala
This production engine includes: exhaust manifolds, intake manifold, supercharger, injectors, fuel rail, balancer, water pump and flywheel

Technical Notes: Pulley, belt, p/s pump, a/c pump, starter, alternator and engine cover are not included with this engine

12499529 HP 290 V8 Crate Engine
The HP 290/350 is GM Performance Parts' value leading crate engine, with 290 horsepower @ 5100 RPM, and 326 lb-ft of torque @ 3750 RPM on 87 octane fuel. The HP 290 horsepower will provide great long term durability with its 4-bolt mains, PM steel rods, strong cast aluminum pistons. The camshaft has .450" intake and .460" exhaust lift with hydraulic flat tappets. The cast iron cylinder heads have 1.94" intake and 1.50" exhaust valves with 76 cc combustion chamber. The heads have the conventional 12 bolt intake manifold attaching design used from 1955 through late 1980. This engine was designed to work with the following components: intake manifold 10185063, HEI distributor 93440806, balancer 6272221, flex plate 471529,you will also need a small block starter, water pump and fuel pump. This 350 engine is not intended for marine use, and should be used in 1979 or earlier pre-emissions street vehicles or any off road usage.

Technical Notes: GM Crate Engines are horsepower rated to SAE Standards.

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12499679 Ecotec 2.2L Production Engine
This 4 cylinder Crate Engine (RPO L61) has the following features:
DOHC with Sequential Fuel Injection
Bore is 86.00 mm and Stroke is 94.60 mm with 10:1 compression ratio
140 Horsepower @ 5600 RPM and 150 lb-ft @ 4000 RPM torque
This engine powers the current Saturn Ion, Chevrolet Cavalier, Pontiac Sunfire and Grand Am, Oldsmobile Alero, and Chevrolet Malibu
This production engine includes: exhaust manifold, intake manifolds, injectors, fuel rail, balancer and water pump

Technical Notes: Pulley, belt, p/s pump, a/c pump, starter, alternator, and engine cover, are not included with this engine

Additional Technical Information/Printable PDF

12568722 LS1 Production Engine
This 2004 LS1 Engine Production Engine is 320 Horsepower with 330 ft. lb of torque and is used in the 2004 Pontiac GTO. It makes a great engine for a performance vehicle. Included in the engine are the block, crank, rods, pistons, cam, aluminum cylinder head, water pump, intake manifold, injectors, cable driven throttle body, exhaust manifolds, balancer, and flex plate. "DOES NOT INCLUDE ECM OR WIRE HARNESS" For engine service parts refer to 2004 GTO catalog.

Technical Notes:

Technical Features:
Aluminum 6-bolt main engine block
Nodular iron crankshaft with undercut and rolled fillets
5.098" powdered metal connecting rods
Flat top, lightweight pistons
Hydraulic roller camshaft (0.500 lift / 200 / 203 degrees 0.050 duration)
Symmetrical port heads w/ 2.00/1.55 valves
1.7 ratio investment cast roller rocker arms
Composite inlet manifold with tuned runners
Single bore throttle body
Return-less fuel rail with 25lb/hr injectors 58 psi
Tubular log-style exhaust manifolds
Cast aluminum oil pan
14-inch flexplate

LS1 Technical Information:
Bore / Stroke         3.98 / 3.62
Compression Ratio   10.25:1
Gross Power         320 HP @ 5800 RPM
Gross Torque        330 Lb-Ft @ 4400 RPM

12568774 454 HO
The 454 HO offers tremendous value in a big block crate engine. Based on the Gen VI block, this 425 horsepower cast iron head engine is a great choice for that muscle car in the garage. We've heard of several of our customers replacing their rare matching number 396, 427 or 454 with our 454 HO in order to drive their car on today's gasoline without fear of destroying their classic engine. The HO stands for high output, it also stands for big valves, rectangular ports, forged pistons, forged steel crankshaft, forged connecting rods and four bolt mains. Sounds a lot like the performance big blocks of the late 60's doesn't it? When you add in the steel roller camshaft, shotpeened rods, windage tray, one piece rear main seal and high speed single roller timing chain, it starts to sound more like the performance big block of the new millennium. And it is.

The 454 HO makes 500 ft.lbs of torque with its rectangular port open chamber cylinder heads. With 118cc combustion chambers, the modest 8.75 to 1 compression ratio loves today's pump premium and has no appetite for lead, octane boosters or other fuel additives. Its 2.19" intake and 1.88" exhaust valves and high lift .510"/.540" roller cam let it breathe with the best of the early muscle motors.

With your carburetor, HEI distributor, exhaust system and bright red '67 Corvette coupe (sold separately 34 years ago), you've got a muscle cruiser worthy of your time, effort and expertise. And, if you want to use your muscle car's fuel system with a mechanical fuel pump, you can because the 454 HO Gen VI block has a conventional style fuel pump boss.

The 454 HO is not intended for marine use, and should only be used in 1976 and earlier pre-emissions street vehicles or any year off road vehicles.

12568778 502 HO
There is no replacement for displacement, and torque is king. With 550 Ft. Lbs. of torque the 502 HO will launch your car harder than you thought possible. With its 450 horsepower and awesome torque the 502 HO may have the best power to dollar ratio going. If your car is all steel, you'll appreciate the power of the 502 HO and if your car is a light weight racer, say 2300 pounds, the 550 ft.lbs. of torque will put a big ol' grin on your face. This engine is awesome. Starting with a Gen VI four bolt main block, we fill it with forged pistons, forged 4340 steel connecting rods with 7/16" bolts, a 1053 forged steel crankshaft, and a steel roller camshaft. Then we torque down a pair of big breathing rectangular port heads with 2.19" intake and 1.88" exhaust valves. With their 118cc combustion chambers yielding a streetable 8.75 to 1 compression ratio, this engine is ready to rock on readily available pump premium. We then top it all off with an aluminum dual plane intake manifold and dress the engine with a cast iron water pump, 6 quart oil pan, windage tray, 14" flexplate and torsional damper. So, all you need to do is provide an 750 cfm carburetor, HEI ignition system, headers with 2"x30" primaries and low restriction mufflers and a car with big sticky tires. Sounds simple, and it is. Check with your GM Performance Parts Authorized Center for specific oil pan needs for your application. The 502 HO requires an electric fuel pump because the 502 Gen VI block has no mechanical fuel pump boss. The 502 HO is not intended for marine use, and should only be used in 1975 and earlier pre-emissions street vehicles or any year off road vehicles.

24502609 ZZ4
Imagine an aluminum head small block that makes 355 horsepower. What if it had a steel roller camshaft, four bolt main block, undercut rolled fillet crankshaft, high silicon pistons and strong PM connecting rods? We imagined it, and then engineered, developed, tested and built it. The ZZ4 is the evolution of our popular ZZ series of small blocks that power thousands of street rods, hot street cars, circle track racers and drag racers. With over 400 ft.lbs. of torque, the ZZ4 is the best way to put an aluminum head, roller cam, high performance small block between your favorite fenders. The aluminum angle plug cylinder heads have screw in rocker studs, 1.94" intake and 1.50" exhaust valves and 58cc combustion chambers that yield a crisp and responsive 10 to 1 compression ratio. Also included are our lightweight valve spring retainers that weigh half as much as our previous design. The valve seats are radiused and we've included valve stem seals to help keep the oil where it belongs. To compliment the cylinder head design, we've incorporated a steel roller tappet camshaft with .474" intake and .510" exhaust valve lift. The combination makes 355 horsepower at 5250 rpm and has that great sounding muscle car idle, with just enough lope to let people know that this is no station wagon engine. Also included with the ZZ4 is an HEI distributor with an ignition timing advance curve developed for performance, a dual plane aluminum intake manifold that accepts your spread bore or square bore carburetor, an 8" high-RPM torsional damper, 12.75" auto trans flex plate and cast iron water pump. The ZZ4 is currently our most popular crate engine, and you can see why. With a long history of successes in circle track and drag racing as well as street rods and other performance applications, the ZZ4 may just be the bullet for your next project. The ZZ4 is not intended for marine use, and should only be used in 1976 and earlier pre-emissions street vehicles or any year off road vehicles.

25534322 LS1 Engine Kit
This is the state of the art setup for your hotrod (320 HP and 345 Torque). This (F-Car) Camaro/Firebird LS1 engine kit includes the LS1 engine complete with fuel injectors, exhaust manifolds, and flex plate. The engine features an aluminum block and cylinder heads with 10.25:1 compression ratio. The engine kit is supplied with ECM, and wire harness that allows this engine to be installed with a four-speed automatic transmission (4L60E) in any 1975 or earlier vehicle.

Additional Technical Information/Printable PDF

88890533 502 Retro-Kit Truck Engine Conversion Kit
This new emission-legal (50 state) Retro-Kit engine conversion kit is designed for 1991-93 Chevrolet and GMC 10, 20 and 30-series trucks with 2-wheel drive, originally equipped with a 454 TBI engine and 4L80E automatic overdrive transmission. (Will not work on 4-wheel drive because of exhaust interference.) Factory engineered for improved towing performance, the massive GEN 6 502 big-block is a bolt-in replacement for a high mileage 454. The increased displacement and improved breathing produces a significant improvement in pulling power over the production 454 truck engine.

The 502 engine is tuned for torque with high velocity round port heads and Vortec L29 hydraulic roller camshaft. This combination yields 515 lb ft. of torque at a stump pulling 2800 rpm and 320 horsepower at 4400 rpm. This retro-kit engine package uses the same rugged bottom end as the 502 HO engine assembly. The siamesed bore block incorporates four-bolt main bearing caps, a forged steel crankshaft, heavy duty connecting rods and forged aluminum pistons. The long block assembly comes fully assembled and is designed to utilize the existing 454 TBI inlet manifold, ignition system and accessory drive components.

A specific engine computer chip, dual catalyst exhaust system, and additional fuel and transmission hardware is included to complete the conversion. The California Air Resources Board (CARB) has issued an exemption order for this conversion. (Automatic transmission use only)

502 Engine Specifications for the Retro-Engine Kit Engine Conversion:

Part Number: 12360893
Displacement: 8.2L or 502 cubic inches
Compression Ratio: 8.75:1
Gross Horsepower: 328 at 4400 rpm
Bore/Stroke: 4.446 in./4.00 in.
Engine Block: GEN 6 design with 4-bolt mains and siamesed cylinder bores
Crankshaft: Forged 1053 steel, one-piece rear main seal

Connecting Rods: Forged 4340 steel with 7/16" rod bits
Pistons: Forged aluminum with mini-dome
Camshaft: L29 hydraulic roller P/N 12552296
Valve Lift (Inlet/Exhaust): 0.480"/0.483"
Duration at 0.050" cam lift (Inlet/Exhaust): 204/209 degrees
Cylinder Heads: Cast iron round port with 2.07"/1.72" valves and 118 cc open combustion chamber
Flywheel: 14"diameter flexplate w/dual torque converter pattern
Gross Torque: 515 lb. ft. at 2800 rpm
Spark Timing: See tune-up label on truck
Fuel: Unleaded premium 92 octane (R+M/2)
- Factory engineered engine conversion
- Emission-legal in 50 states (CARB E.O. # D-126-4)
- Fully assembled long block less manifolds, distributor, and water pump
- 6016 steel distributor drive gear for roller camshaft
- Low restriction 454 SS dual catalyst, dual exhaust system
- 18 psi fuel pressure regulator
- High flow in-tank fuel pump
- PROM chip specially calibrated for 502 engine
- Revised transmission spacer plate for positive shifts
- Auxiliary transmission oil cooler
- Transmission oil pan with drain plug
- Comprehensive installation guide

502 Retro-Kit Truck Engine Conversion Kit

88890534 HT 502
The key to towing performance is torque, and the HT 502 crate engine has got a whole lot of it. Not only does this crate engine make torque, but it makes it right where you need it, way down low. With 512 ft.lbs. of torque at an incredibly low 2800 RPM and 338 horse power at 4500 RPM, this engine will climb hills, accelerate onto the highway and pull out to pass with the sort of confidence that you've come to expect from a GM Performance Parts crate engine.

So for not too much more than a rebuild of your tired big block tow motor, you can step up to an all new HT 502 developed specifically for towing and heavy vehicle applications in 20 and 30 series light duty trucks. If you're concerned about durability, don't be. We've used the same four bolt block that we use in our other high performance 502's, and filled it with a forged crankshaft, forged connecting rods, and forged pistons. It even has a steel roller camshaft, designed to work in perfect harmony with the high velocity cast iron cylinder heads. The heads, with their moderately sized valves and round intake ports, ensure maximum cylinder fill at low RPM, and that means excellent low RPM efficiency that equates to maximized low end power and torque.

The 502 Truck Conversion engine comes assembled, but needs your intake manifold, carburetor, water pump and distributor to run. It's time to upgrade, and GM Performance Parts has your engine, the HT 502 is a High Torque workhorse that will get you, your trailer and your crew to the races without even breaking a sweat.

The HT 502 is intended for 1976 and earlier Chevrolet and GMC 20-series and 30 series trucks. The HT 502 is not intended for use with electronic fuel injection. When used with electronic fuel injection, under certain heavy load and high altitude conditions, engine damage may occur due to a lean fuel mixture condition.

The HT 502 is not intended for marine use, and should only be used in 1976 and earlier pre-emissions street vehicles or any year off road vehicles.

88958602 GMR 350/350 Circle Track Engine
Great racing power at a reasonable cost (350 HP at 5000 RPM _ torque 390 @ 4000 RPM)

This is a factory sealed crate engine package, complete from high rise dual plane intake manifold, stamped steel valve covers with racing style breathers, and 8 quart single kick-out circle track racing oil pan.

The 350 engine is a great value with the nodular cast iron crankshaft, iron vortec heads with 1.94"/1.50" valves, flat tappet hydraulic lifters, and HEI distributor.

The base engine is a 330 HP 350ci, with the following parts:

P/N 10105123 4 bolt iron block
P/N 14088527 Nodular cast iron crankshaft
P/N 10108688 PM rod
P/N 12361371 Cast aluminum piston
P/N 24502476 Camshaft with hydraulic flat tappet lifters
P/N 12558060 Iron vortec head
P/N 12366573 High rise dual plane intake manifold
P/N 1104067 HEI distributor
P/N 25534353 8 quart circle track oil pan (with oil filter)
P/N 25534359 Valve cover kit with breather tube
P/N 25534355 Valve cover breather kit
P/N 25534352 Special rocker arm nut "kool nut design"

Technical Notes: These engines are sealed at the intake manifold, cylinder head, front cover, and oil pan with special twist off bolt heads. The 350 HP @ 5000 RPM was derived from a super flow dyno using a 4 barrel 650 cfm Holley carburetor P/N 80541-1, 32" long by 1 5/8" to a 1 3/4" stepped header with a 3" collector, and 92 octane unleaded gasoline. This engine package DOES NOT include a water pump. Oil pan clears most GM rear steer chassis with stock engine location. Oil pan is 8" deep at sump.

Additional Technical Information/Printable PDF

88958603 GMR 350/355 Circle Track Engine
Great racing power at a reasonable cost
(355 HP at 5250 RPM - Torque 405 @ 3500 RPM)

This is a factory sealed crate engine package, complete from intake manifold, stamped steel valve covers with racing style breathers, and 8 quart dual kick-out circle track racing oil pan. The ZZ4 engine is a great value with the 1053 forged steel crankshaft, aluminum heads with 1.94"/1.50" valves, hydraulic roller lifters, HEI distributor, and normal rotation iron water pump included.

The base engine is a ZZ4 350ci 355 horsepower, with the following parts:

P/N 10105123 4 bolt iron block
P/N 14088533 1053 steel crankshaft
P/N 10108688 PM rod
P/N 10159436 High silicon aluminum piston
P/N 10185071 Camshaft with hydraulic roller lifters
P/N 12556463 Aluminum head
P/N 10185063 Dual plane intake manifold
P/N 1104067 HEI distributor
P/N 25534354 8 quart circle track oil pan (with oil filter)
P/N 25534359 Valve cover kit with breather tube
P/N 25534355 Valve cover breather kit
P/N 25534352 Special rocker arm nut "kool nut design"

Technical Notes: These engines are sealed at the intake manifold, cylinder head, front cover, and oil pan with special twist off bolt heads. The 355 HP @ 5500 RPM was derived from a super flow dyno using a 4 barrel 650 cfm Holley carburetor P/N 80541-1, 32" long by 1 5/8" to a 1 3/4" stepped header with a 3" collector, and 92 octane unleaded gasoline. Oil pan clears most GM rear steer chassis with stock engine location. Oil pan is 7" deep at sump.

Additional Technical Information/Printable PDF

88958604 GMR 350/400 Circle Track Engine
Great racing power at a reasonable cost
(400 HP at 5500 RPM - Torque 400 @ 4500 RPM)

This is a factory sealed crate engine package, complete from intake manifold, stamped steel valve covers with racing style breathers, and 8 quart dual kick-out circle track racing oil pan. The Fast Burn 400 engine is a great value with the 1053 forged steel crankshaft, aluminum heads with 2.00"/1.55" valves, hydraulic roller lifters, HEI distributor, and normal rotation iron water pump included.

The base engine is a Fast Burn 350ci 385 horsepower, with the following parts:
P/N 10105123 4 bolt iron block
P/N 14088533 1053 steel crankshaft
P/N 10108688 PM rod
P/N 10159436 High silicon aluminum piston
P/N 10185071 Camshaft with hydraulic roller lifters
P/N 12464298 Aluminum head
P/N 12496822 High rise single plane intake manifold
P/N 1104067 HEI distributor
P/N 25534354 8 quart circle track oil pan (with oil filter)
P/N 25534359 Valve cover kit with breather tube
P/N 25534355 Valve cover breather kit
P/N 25534352 Special rocker arm nut "kool nut design"