Exhaust manifold differences 502 vs 525 efi
 

How do the factory exhaust manifolds differ from one another on the 502 mpi and the 525 efi engines? Can they be interchanged?

No. The 525 comes with headers on a different bolt pattern. 502 mpi is reg manifolds on standard bbc bolt pattern

NO, the 525 has Edelbrock alum heads and a non standard exhaust bolt pattern, the 502 has a standard BBC bolt pattern


haha typing at the same time

Thanks guys. I am building a manifold set-up and was hoping I could cater it to both engines, but I will have to do 2 I suppose! Are they both the same angle heads? Could I simply swap the cylinder head flange to make it work on both?

Are you building headers, dont really understand the Q

Somewhat, yes. I was wondering if I build them based on the 502 if they could also be used on a 525 efi. Now that I know they are different, would a flange swap be all that is required to make that happen?

yep, if you change the flange to match the 525 bolt pattern

Easy enough! Thanks!!

just a side note, the bottom 4 holes will line up, its the upper four that wont, beleive me I know, I redrilled my CMI GenX to fit my AFR heads,

I'll have to get a pair of each in hand to check them out. I wonder if the flange was drilled for BOTH if any issues would result or if this would allow them to work on both!?

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Cmi headers come drilled with both bolt patterns

not all, that was the reason for my post, mine must be the sweepers,

Great to know, I will drill them for both!!

Another question on the same platforms: Intake Manifolds. Will they swap from a 502 MPI to a 525 EFI? Could you take a 502 MPI and run the intake manifold set-up from a 525 EFI manifold set-up on it?

Yes, the 525 is a 502 based engine

Excellent, we should have a very cool project underway shortly! Thanks!