Offshoreonly.com - what is the difference

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Ken N

06-10-2008 09:56 AM

what is the difference

What is the major difference between a 502-415 HP MPI and a 500 HP EFI.

DareDevil

06-10-2008 10:20 AM

60 HP and the internal parts ,as far i know.

Warlock28SXT

06-10-2008 10:27 AM

http://www.offshoreonly.com/forums/s...502+mpi+500efi

Here is some info. Do a search on here I'm sure you will find more about it than this.

Griff

06-10-2008 10:30 AM

It depends on the year. The shortblocks used to be the same on earlier versions. Newer versions had Manley rods. Heads are GM rect ports on both. Cam, springs, rockers, intake, ECM program and fuel injection are different.

Ken N

06-10-2008 10:42 AM

Quote:

Originally Posted by Griff (Post 2585732)

I have a 1999, would that be a Manley rod version.

Griff

06-10-2008 10:36 PM

I should have said the Manley rods are only in the newer 500EFI's. The 502mpi's have GM forged rods.
It depends on the serial # for the 500EFI. It looks like #OL306500 and higher have the manley rods.

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