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-   -   Mercury HP525EFI Exhaust (https://www.offshoreonly.com/forums/general-q/79626-mercury-hp525efi-exhaust.html)

DanB 05-23-2004 11:59 AM
Re: Mercury HP525EFI Exhaust
 
The heads on a 525 are made by Edelbrock, and unless they did something different just for a 525 which I seriously doubt, any BB header should fit. They prob raised the ext ports like the Merlin heads are, but the port location and header bolt pattern are the same. But...stranger things have happened. Might call Edelbrock to confirm. The cmi's prob have 32" runners vs the short runners the E tops have. I dont think they make the 2 piece split tubes any more.

T/Motorsports 05-23-2004 12:06 PM
Re: Mercury HP525EFI Exhaust
 
Originally Posted by john.sblendorio
Did I understand you correctly, the heads on the 525 are a special design and the pattern on the headers will only fit a 525?
When I talked with CMI,The 525 headers will also fit the 500 HP heads also,The bottom 4 holes are the only difference put the 500 HP header gasket up to the header and drill 4 new bottom holes in the 525 style header, Then they match perfectly to the 500 HP heads, Per CMI.


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