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ok, thanks Professor Fate, that makes sense.

Thanks guys but it’s strange as most intake gaskets for Poly 318’s are shown with those rear water ports open. Only the Marine version has them blocked.

Can anyone tell me why the Chrysler Marine Poly 318 intake gasket has the rear water passages blocked off? https://marysvillemarine.com/media/catalog/product/cache/5fb6dfe37e98ca467e76f28a8de5af3e/0/0/0007224e_lg.jpg Thanks in advance, Mike

Ok, thanks again. .I will update

Thanks so much for your reply str12-340. Yes, the valve covers are just two bolts. I am in the Detroit area and should be able to find a good shop to do the machining. Thanks again.

Hello to all, I have a 1966 Chris-Craft cabin cruiser with two 318's, Marine version. One of them burned a piston so I was going to get two rebuilt long blocks and swap them out. But here's the question. Since this boat was built in 1966, I assume the engines to be 1965's or possibly very...