Exhaust Headers / 525 Mercury Racing Engines

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11-01-2010 | 02:32 PM

#51

omerta one

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Joined: Apr 2006

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From: LOTO

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

11-01-2010 | 04:57 PM

#52

575cat

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From: minnesota

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

11-01-2010 | 06:30 PM

#53

Expensive Date

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From: West Creek NJ

Quote:

Originally Posted by 575cat

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.

11-01-2010 | 06:31 PM

#54

Expensive Date

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From: West Creek NJ

Quote:

Originally Posted by BKSAE

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

11-01-2010 | 06:42 PM

#55

Wildman_grafix

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From: Merritt Island, FL

Quote:

Originally Posted by Expensive Date

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

They do look the same.

11-01-2010 | 06:45 PM

#56

575cat

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From: minnesota

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 .

Last edited by 575cat; 11-01-2010 at 06:59 PM.

11-01-2010 | 06:49 PM

#57

Anarchy Powerboats

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Quote:

Originally Posted by Expensive Date

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.

11-01-2010 | 07:12 PM

#58

CPPerformance

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From: Rohnert Park, CA

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

11-01-2010 | 08:50 PM

#59

BKSAE

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From: IN & KY

Quote:

Originally Posted by CPPerformance

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?

11-02-2010 | 04:44 AM

#60

Phazar454Mag

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Posts: 391

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From: Denmark

Quote:

Originally Posted by BKSAE

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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