Difference between a 502/500efi/525efi

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10-18-2011 | 08:25 PM

#11

thirdchildhood

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From: Clarkston, Michigan

Also the 525 has closed cooling and no distributor.

10-18-2011 | 09:12 PM

#12

Powerquest230

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From: Palm Harbor, FL

Which heads are used on the 525's?

10-18-2011 | 09:20 PM

#13

searaycer

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From: Naples Fl

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

10-18-2011 | 09:21 PM

#14

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From: On A Dirt Floor

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

Almost forgot to add:

502MPI cost $
500EFI cost $$
525EFI cost $$$

10-19-2011 | 01:02 AM

#15

Griff

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From: Omaha/LOTO

Quote:

Originally Posted by searaycer

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.

10-19-2011 | 06:58 AM

#16

Dave M

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From: Hollywood, MD, USA

Quote:

Originally Posted by SB

Almost forgot to add:

502MPI cost $
500EFI cost $$
525EFI cost $$$

I was waiting for that!

10-19-2011 | 09:13 AM

#17

bcfountain

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From: prince george,va

Quote:

Originally Posted by SB

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

Almost forgot to add:

502MPI cost $
500EFI cost $$
525EFI cost $$$

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

10-19-2011 | 05:36 PM

#18

Carbon Footprint

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From: Colorado

Does a 502 mag mpi have forged internals? 1997

10-19-2011 | 08:19 PM

#19

Zone 5

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Quote:

Originally Posted by high&Dry

Does a 502 mag mpi have forged internals? 1997

yes.

10-20-2011 | 11:15 AM

#20

Whipple Charged

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From: Fresno, CA, 93722, USA

Quote:

Originally Posted by searaycer

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...

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