Offshoreonly.com - Difference between a 502/500efi/525efi

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- - Difference between a 502/500efi/525efi (https://www.offshoreonly.com/forums/general-q/264233-difference-between-502-500efi-525efi.html)

thirdchildhood

10-18-2011 08:25 PM

Also the 525 has closed cooling and no distributor.

Powerquest230

10-18-2011 09:12 PM

Which heads are used on the 525's?

searaycer

10-18-2011 09:20 PM

Edelbrock aluminum... I believe same as Performer RPM, not Victors though.

SB	10-18-2011 09:21 PM

502MPI has stock crappy exhaust. Other two CMI's.
Intakes are different on all 3.

Almost forgot to add:

502MPI cost $
500EFI cost $$
525EFI cost $$$
:lolhit:

Griff

10-19-2011 01:02 AM

Quote:

Originally Posted by searaycer (Post 3530662)

My 500 efi had Manley h beams with Mercury Racing etched on the side when Potter tore it down.

They switched to the Manley rods after about the second year of the 500efi.

Dave M

10-19-2011 06:58 AM

Quote:

Originally Posted by SB (Post 3530900)

Almost forgot to add:

502MPI cost $
500EFI cost $$
525EFI cost $$$
:lolhit:

I was waiting for that! :party-smiley-004:

bcfountain

10-19-2011 09:13 AM

Quote:

Originally Posted by SB (Post 3530900)

502MPI has stock crappy exhaust. Other two CMI's.
Intakes are different on all 3.

Almost forgot to add:

502MPI cost $
500EFI cost $$
525EFI cost $$$
:lolhit:

now thats language we can all relate to.kinda like good,better,best.

Carbon Footprint

10-19-2011 05:36 PM

Does a 502 mag mpi have forged internals? 1997

Zone 5

10-19-2011 08:19 PM

Quote:

Originally Posted by high&Dry (Post 3531624)

Does a 502 mag mpi have forged internals? 1997

yes.

Whipple Charged

10-20-2011 11:15 AM

Quote:

Originally Posted by searaycer (Post 3530898)

Edelbrock aluminum... I believe same as Performer RPM, not Victors though.

There casted/machined by Edelbrock, but they are not the same as the Performers. It has Mercury's own exhaust bolt pattern and the bosses on the front for the closed cooling. Intake and exhaust runners are quite different, the performers are actually better. These are much closer to GM iron head runner shapes. Don't really know why they didn't just modify the Performers to work...:drink:

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