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Old 06-21-2010, 05:37 PM
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350 marine build

i dont know if this is the right place or not but here is my situation. i have a 19' ski boat with a 350 chevy and omc drive.

i have to rebuild the motor(it locked up)but not sure what to use.

i realize i need stainless steel head gaskets

i guess i need some performance bearings and pistons?

ive never put together a marine engine just looking for sugestions

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Old 06-21-2010, 08:06 PM
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Marine Chevy small block ,basic longblock, engines are virtually the same as automotive counterparts. Except the gasket set is upgraded to marine use. Cam is ground for performance below 5000 rpm.

Nothing mysterious, blocks/heads/bearings/pistons/rings are all the same.
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Old 06-21-2010, 11:30 PM
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Composition head gaskets work just fine, Like Fel-Pro.
A new rotating assy is a great way to go! Hyperutectic pistons will work fine, Little extra piston clearance. Stainless valves never hurt, Depends how you are going to drive it too.. A boat is under the same kind of load as a truck pulling a trailer up a mountain all the time.. If you are going to run it full throttle for long periods of time you will need to spend more money but if you spend most of your time at 3500 RPM no big issues.

One of the big killers is there is usually water left in the exhaust system and there are always exhaust valves open. Water condenses in the cylinders and eventually rusts the cylinders, you will often see where the piston was stopped and where the rings rusted in with the cylinder.
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Old 06-22-2010, 12:33 AM
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Don't forget the brass freeze plugs!
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”

— Han Solo
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