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how will these manifolds flow?

Old 03-23-2005, 07:26 PM
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Default Re: how will these manifolds flow?

Hey, that looks like the manifold I am looking for to bolt onto my snowmobile!!
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Old 03-23-2005, 07:29 PM
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Default Re: how will these manifolds flow?

Cool 2 stroke v8's.....nice expansion chambers!
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Old 03-23-2005, 08:07 PM
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Default Re: how will these manifolds flow?

Classic log manifolds are low performance. There is a great article in Hot Boat this month on just this topic. They dyno compared log manifolds to headers, about a 50hp difference which is HUGE. This was on a 450ish hp engine so 10% change, 70hp with an arrestor change as well.
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Old 03-23-2005, 08:57 PM
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Default Re: how will these manifolds flow?

Only problem is can i use headers safely? The manifolds that came on the boat and the ones in the picture above have water cooled exhaust. How do I know if i can use headers? Are there any water cooled headers?

I'm new to the boating game so if the answers to these questions seem obvious, I appologize.

Last edited by davids94; 03-23-2005 at 09:01 PM.
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Old 03-23-2005, 09:29 PM
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Default Re: how will these manifolds flow?

Definetly looks like Stainless Marine from years ago. A friend of mine has a 27 Magnum with 351 Fords and he has the same ones. Infact they are still running today. Fresh water boating.
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Old 03-24-2005, 08:02 AM
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Default Re: how will these manifolds flow?

so i figured out the answers to my own questions above, my last issue is $$$

am i going to find a decent set of headers (new or used) for under $1000?
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