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Big Block Chevy 502

502/450    502/502    502/502 complete    502/Ram Jet

GM Part # 12568778

450 HP    550 Torque             $6250.00

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.

GM Part # 12496963            $7250.00


     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.
     The Base Engine is a fully assembled long block with valve covers and valve train. The Base Engine includes a fully assembled short block with 2.25” intake aluminum heads, valvetrain, aluminum valve covers, torsional damper and 14” automatic transmission flexplate.
     The king of all big block crate engines is the ZZ502/502, with torque and horsepower that will have you grinning and streetable manners that have your competition wondering what hit them. The ZZ502/502 represents our latest and best efforts to develop awe inspiring big block power in a dependable, durable and drivable big block crate engine.
     With it’s big valve aluminum heads, roller camshaft and complete dyno tuned induction and ignition system, this is as close as you can come to a custom built 502 at crate engine prices.
     The ZZ502/502 makes extensive use of aluminum to keep weight down. This king of the crate engines is full of heavy duty parts, to ensure that it will be making awesome power for a long time. With it’s forged aluminum pistons, forged 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 ZZ502/502 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.
     For anyone looking for more power - GM Performance Parts has designed the hot rodder’s ultimate dream engine. Everything you need to beef up your 1967 or older passenger car or any year off highway vehicles is included in this 502ci/502hp engine. This engine produces a staggering 502 hp with 567 lb ft of torque with a modest 9.6:1 compression ratio. This engine also features an all new oval port aluminum cylinder head design with 2.25” intake and 1.88” exhaust valves and 11/32” valve stems.

GM Part # 12496962

502 HP    567 Torque          $8350.00

DESCRIPTION: ZZ502 Deluxe ENGINE assembled
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 valve train. The deluxe is a complete engine from intake manifold to pan. (Carburetor and starter included but not installed because of crating.)   See GM # 12496963 for further details

GM Part # 12499121

502 HP    565 Torque             $10,295.00

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 4 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.



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Last modified: 11/20/13.