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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

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...