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502 mag mpi pistons

502 mag mpi pistons

Old 05-20-2020, 03:38 PM
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Default 502 mag mpi pistons

Does anyone know the stock weight of the 502 mag mpi gen vi dome pistons? Im trying to match a new set that is .030 so I dont have to re-balance and the Merc part doesn't give much info on the pistons. I cant even find a part number on the piston anywheres. On the underside its stamped JE700 but as I understand it thats the forging stamp and would not yield any technical data. If I can get the part number off one (which I cant find) I could probably have JE tell me.

After pestering Smitty so much Ive learned JE makes a replacement piston at 699 grams but their .030 over piston is 714 grams. If i knew the stock piston weight Id know if ill have to re-balance. Im not in a position to weigh it as they are at the machine shop waiting on the new pistons and he's gone for the Memorial day weekend.

https://www.jepistons.com/pistons-281916 std bore

https://www.jepistons.com/pistons-281919 .030 bore

Ive read that the flywheels from a gen v 454 mag (steel forged crank) and a gen 6 502 mag are different but Merc offers the same part number for both engines. Since these are externally balanced engines I would think the piston weight differences would warrent different harmonic balancers and flywheels?

The flywheel I have is 14096805

Last edited by cableguy1979; 05-20-2020 at 04:49 PM.
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Old 05-20-2020, 04:11 PM
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Anyone have these in their 502? This came from a gen v 454 but since the gen vi is roller Im not sure it works right for rollers.



Last edited by cableguy1979; 05-21-2020 at 10:00 AM.
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