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Need help on exhaust risers

A

Adrian Nagrant

Guest
"I have a project boat that i

"I have a project boat that i am working on with a omc 350 (1989) this motor has the log style manifolds on it, I want to convert to a thru-hull exhaust. I am wondering if anyone would know if the bolt pattern is the same on that manifold or if a center riser manifold is different. Im trying to purchase the right riser. Thanks in advance.
P.S if anyone has a upper cobra outdrive for me for a couple hundred bucks, that would be nice
"
 
The heads and exhaust ports ar

The heads and exhaust ports are similar for decades on SB Chevies.

Jeff

PS: Please include mufflers! There's too many people making way too much noise out there. Pretty sound the decibel cops will start hassling us.
 
"We have a 89 OMC Donzi 25&#39

"We have a 89 OMC Donzi 25' that I would like to do the same to, as well as stroke the motor to 383ci. There is not alot of help, in terms of boat forum advise, for these small block boats. I'm in so.Florida. You can e-mail me for info and ideas."
 
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