I WOULD LIKE TO KNOW THE SPECS ON A CHEVY 502 MARKIV CRATE MOTOR....WHAT THE STATED HORSEPOWER IS OUT OF THE BOX AND THE TORQUE......INTERESTED IN PUTTING IT INTO A 1966 VETTE COVERTIBLE....ALSO ARE THERE ANY ARTICLES WRITTEN ABOUT THIS MOTOR I CAN READ.
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Re: crate 502 motor MARK IV
Mark----
There is no Mark IV 502 crate motor. The Mark IV big blocks were discontinued from production after 1991. Starting in 1992, GM began producing the "Gen V" big block and a few years ago, that engine was superceded by the "Gen VI". The Gen VI remains in production in several variants, including 366(truck), 427(truck), 454(truck, hi-perf, and marine), and 502(truck, hi-perf and marine).
There are several 502 CID Gen VI crate engines currently available. The first is GM #12371054, which is rated at 338hp @4500 RPM and 512 ft/lbs of torque @ 2800 RPM. This is the "torque monster", primarily designed for towing.
The second 502 is GM #24502620. This engine is rated at 450 hp @5250 RPM and 550 ft/lbs of torque at 3500 RPM. This engine is designed for hi-performance passenger car applications.
The third 502 is GM #12371171 which is available as an unassembled kit. This is the highest output 502 and is rated at 502 hp @ 5200 RPM and 567 ft/lbs of torque @ 4200 RPM (when assembled, of course).
All of the above engines use forged steel crankshafts and forged aluminum pistons as well as hydraulic roller camshafts. However, none are equipped with a machined fuel pump boss, so an electric fuel pump must be used.
The only crate engine assembly available with a machined fuel pump boss is GM #24502618. This is a 454 cid engine rated at 425 hp @5200 RPM and 500 lb/ft of torque at 3200 RPM. It also includes forged steel crank, forged pistons and hydraulic roller cam.In Appreciation of John Hinckley -
Re: crate 502 motor MARK IV
Mark----
There is no Mark IV 502 crate motor. The Mark IV big blocks were discontinued from production after 1991. Starting in 1992, GM began producing the "Gen V" big block and a few years ago, that engine was superceded by the "Gen VI". The Gen VI remains in production in several variants, including 366(truck), 427(truck), 454(truck, hi-perf, and marine), and 502(truck, hi-perf and marine).
There are several 502 CID Gen VI crate engines currently available. The first is GM #12371054, which is rated at 338hp @4500 RPM and 512 ft/lbs of torque @ 2800 RPM. This is the "torque monster", primarily designed for towing.
The second 502 is GM #24502620. This engine is rated at 450 hp @5250 RPM and 550 ft/lbs of torque at 3500 RPM. This engine is designed for hi-performance passenger car applications.
The third 502 is GM #12371171 which is available as an unassembled kit. This is the highest output 502 and is rated at 502 hp @ 5200 RPM and 567 ft/lbs of torque @ 4200 RPM (when assembled, of course).
All of the above engines use forged steel crankshafts and forged aluminum pistons as well as hydraulic roller camshafts. However, none are equipped with a machined fuel pump boss, so an electric fuel pump must be used.
The only crate engine assembly available with a machined fuel pump boss is GM #24502618. This is a 454 cid engine rated at 425 hp @5200 RPM and 500 lb/ft of torque at 3200 RPM. It also includes forged steel crank, forged pistons and hydraulic roller cam.In Appreciation of John HinckleyComment
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Re: crate 502 motor MARK IV
One more thing to consider is the lack of a mounting boss for the clutch z-bar (cross shaft) on these late model engines. This poses no problem for an automatic car, but a frustrating one for a manual trans car. I havent found anyone making a bracket for a corvette application yet, and have always had to have a bracket custom made.
DennisComment
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Re: crate 502 motor MARK IV
One more thing to consider is the lack of a mounting boss for the clutch z-bar (cross shaft) on these late model engines. This poses no problem for an automatic car, but a frustrating one for a manual trans car. I havent found anyone making a bracket for a corvette application yet, and have always had to have a bracket custom made.
DennisComment
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Re: crate 502 motor MARK IV
Dennis----
I thought that the Gen VI engines "reintroduced" the clutch cross shaft mount. Have you installed a Gen VI? I'd be interested. If not, I'll check on this feature.In Appreciation of John HinckleyComment
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Re: crate 502 motor MARK IV
Dennis----
I thought that the Gen VI engines "reintroduced" the clutch cross shaft mount. Have you installed a Gen VI? I'd be interested. If not, I'll check on this feature.In Appreciation of John HinckleyComment
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Everything you want to know about the 502......
can be found at:
WWW.sallee-chevrolet.com. They will sell you the Z-bar for about $130.00, also, no mechanical fuel pump, therefore, you will also need to purchase an electric.
If you buy the 502 unassembled, you will need to have the block finish bored and honed. If you do that, than you might as well bore it out to 4.5" and get pistons from a number of sources for about $50.00 LESS than what GM is asking for pistons for the 4.47" bore.Comment
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Everything you want to know about the 502......
can be found at:
WWW.sallee-chevrolet.com. They will sell you the Z-bar for about $130.00, also, no mechanical fuel pump, therefore, you will also need to purchase an electric.
If you buy the 502 unassembled, you will need to have the block finish bored and honed. If you do that, than you might as well bore it out to 4.5" and get pistons from a number of sources for about $50.00 LESS than what GM is asking for pistons for the 4.47" bore.Comment
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