Re: HP525 EFI Dyno Numbers
 

It's the same as my 741 cam except for the LSA 112 vs 114 :)
The Gen VI 741 cams (168741) have the same duration and lift 236/244 .610/.632 as the cam in the 525. With the 525 obviously being a Gen VI they've just spread the centers a bit on the 741 Gen VI cam.
The Gen IV stuff has less duration all be it slightly.
Dave

Re: HP525 EFI Dyno Numbers
 

Does anyone know exactly what edlebrock head is on the 525?

Re: HP525 EFI Dyno Numbers
 

ttt

Re: HP525 EFI Dyno Numbers
 

Wags,
A phone call to Innovation might get you an answer.
Russ

Re: HP525 EFI Dyno Numbers
 

The same Edelbrock marine head that you can buy from Summit.
Rectangular port, anodized with inconel exhaust valves.
(#61559) Does not come with springs, studs, etc. Just valves and seals.
Good head but a bit thin decked for blower apps from my experience.

Re: HP525 EFI Dyno Numbers
 

Experience is a *****. :rolleyes: How's it going Dave?

Re: HP525 EFI Dyno Numbers
 

Hey Tom,
Experience seems to help everyone else but the victim :drink: :D
Later,
Dave

Re: HP525 EFI Dyno Numbers
 

I thought it was the Edelbrock oval port head. 290cc on the 525

Re: HP525 EFI Dyno Numbers
 

It may be...
I was just assuming that with the chambers being 110cc on the ovals and 118cc on the rectangular the compression ratio would work out to the specified 8.75:1 on the rectangulars. That and I didn't think Merc would want to re-tool the intake :)
Could be wrong...anybody know for sure? They're probably too new for anyone to be tearing them down yet :rolleyes:

Re: HP525 EFI Dyno Numbers
 

The heads are made especially for Mercury. They even have "Mercury" casted on them. The exhaust bolt pattern is slightly different from a "standard" BBC head.