Offshoreonly.com - Exhaust Headers / 525 Mercury Racing Engines

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- - Exhaust Headers / 525 Mercury Racing Engines (https://www.offshoreonly.com/forums/general-q/241634-exhaust-headers-525-mercury-racing-engines.html)

omerta one

11-01-2010 02:32 PM

What is normal life expectancy for headers in terms of years vs hours; salt vs fresh???

575cat

11-01-2010 04:57 PM

What do you guys think of stainless marine gen 3 header manifold system, theyre supposed to breath better than tube headers and last !

Expensive Date

11-01-2010 06:30 PM

Quote:

Originally Posted by 575cat (Post 3243831)

What do you guys think of stainless marine gen 3 header manifold system, theyre supposed to breath better than tube headers and last !

I believe thats what went on the 41 Pantera.

Expensive Date

11-01-2010 06:31 PM

Quote:

Originally Posted by BKSAE (Post 3243695)

How about the 600 SCi's or 700 Sci's. There headers look the same-are they?

Good question I have never heard of it happing to those engines so maybe they are different

Wildman_grafix

11-01-2010 06:42 PM

Quote:

Originally Posted by Expensive Date (Post 3243893)

Good question I have never heard of it happing to those engines so maybe they are different

They do look the same.

575cat

11-01-2010 06:45 PM

I believe someone was looking for a single header for a 600 or 700 a couple months back because of a crack issue. I talked to jerry at stainless marine last weak and he says they have had only one failure in 20 + years, an external water leak, he says if the manifold leaks it is designed to leak externally .

Anarchy Powerboats

11-01-2010 06:49 PM

Quote:

Originally Posted by Expensive Date (Post 3242817)

So in review 496s spit the pistons out,and 525s due to poor quality headers dump water into the cylinders.

The big big problem with the 496ho is the pushrods and valvetrain.

CPPerformance

11-01-2010 07:12 PM

This unfortunately has been becoming a common problem that's why we offer both Hardin Marine Typhoon and CMI Gen X 525 replacement header systems..

Hardin Marine

CMI

BKSAE

11-01-2010 08:50 PM

Quote:

Originally Posted by CPPerformance (Post 3243932)

This unfortunately has been becoming a common problem that's why we offer both Hardin Marine Typhoon and CMI Gen X 525 replacement header systems..

Hardin Marine

CMI

Your CMI link leads me to believe that the headers are also the same for the 600 and 700 SCi's. Is this the case?

Phazar454Mag

11-02-2010 04:44 AM

Quote:

Originally Posted by BKSAE (Post 3244033)

Your CMI link leads me to believe that the headers are also the same for the 600 and 700 SCi's. Is this the case?

Looking here http://www.mercruiserparts.com/selec...asp?type_id=8H it seems the part number is the same for the exhaust headers for the 525EFI, 600 and 700 SCis.

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