Thread: 1979 Ford 302 Engine problem

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I know the Shamrock boat well, they built them right here in Cape Coral, Florida. I think you have nailed it with the carb situation. What is causing you to have a problem finding a replacement? If you are looking for the exact carb that might be tough, but you can adapt any MARINE carb to it as long as the bolt pattern is the same. I stress MARINE carb as you do not want to put a car carb on it under any circumstances (BOOOOOOOOOOOM!!! ) Same goes for fuel pump, distributor, alternator and starter.........use only those designed not to cause an explosion.

If the bolt pattern is the problem you can swap out the intake for any sbf intake, they are the same as the automobile versions. Then you can use a carb that will fit the bolt pattern. BTW, how old are your exhaust manifolds? Have them pressure tested because a leaking one will wipe out your new rebuild in a heartbeat if water gets into the cylinders.

For a little history on your Shamrock, I know George who started the company. He was in the Navy in WWII and saw the landing crafts with the protective keels under them. When he got home he started building pleasure boats with the same keel-drive system, primarily because of all the shallow water we have here in Florida. They have some unique handling characteristics because of it, and are not necessarily the driest running boat made, but they are built like a tank........especially the ones from your era.

I would also check out your ignition system, but the fact you say it is loading up leans me toward the carb first. BTW, you can switch to a four barrel if you swap the intake manifold too.

Don