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Stainless Marine 525 exhaust

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Old 01-06-2011, 10:21 PM
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Default Stainless Marine 525 exhaust

Seems to be a hot topic lately and while I don't currently have CMI headers on my boat will most likely have them on my next.With everything I have heard about them they will not be there long.There seemed to be different opinions on if you could use Stainless Marine exhaust on the 525s so I spoke with Jerry at Stainless today.Yes you can but you have to re-drill and tap the heads as they are not GM heads the bolt pattern is different.Stainless Marine has a jig to do this and they will lend it out (with a deposit) to anyone who buys there product.There are a couple of other minor modifications like moving the water tank but the also offer the bracket for that.

Stainless Marine 525 exhaust-p1030144.jpg

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Old 01-07-2011, 06:36 AM
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I assuming that this will work with the GEN III manifolds also?
Sounds like a good solution, especially if you can use the GEN III manifolds.
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Old 01-07-2011, 08:26 AM
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Originally Posted by Dean Ferry View Post
I assuming that this will work with the GEN III manifolds also?
Sounds like a good solution, especially if you can use the GEN III manifolds.
Dean
Once you drill the heads its a standard GM pattern you can use anything.
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Old 01-07-2011, 10:21 AM
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Good idea, however I can't imagine drilling a non staggered twin set up with the engines mounted, hard enough just getting the exhaust off.

Still no replacement for the sound of a true header
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Old 01-07-2011, 10:25 AM
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the benefit to stainless marine is that they last a long time and don,t leak like the cmi's.
i think i would rather loose a few pony's to stay reliable and not blow my motor up and it cost lot's of $$$ to fix

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Old 01-07-2011, 10:59 AM
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if you have a blower and gen III's you don't lose anything hp wise.
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Old 01-07-2011, 12:27 PM
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What about making a half inch adapter plate to adapt the bolt pattern?
The Big tubes we use have those to allow for bolt access, they should be available or fairly easy to make
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Old 01-07-2011, 12:57 PM
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Stainless Marine are gonna be my chioce!
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Old 01-07-2011, 01:01 PM
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HOW ABOUT JUST MAKING THE STAINLESS MARINE STUFF FIT;;;JUST LIKE STOCK
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Old 01-07-2011, 01:05 PM
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Quote:
Originally Posted by TWIN-SPINS View Post
HOW ABOUT JUST MAKING THE STAINLESS MARINE STUFF FIT;;;JUST LIKE STOCK
+1 to what he said.
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