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Here is the straight scoop on 273 head gaskets. There is no use in getting a smaller diameter head gasket since the closed combustion chamber, 64-67, measures about 3.97" at the widest point and 4.04" at the original steel shim head gasket witness marks. Since the gaskets need to be sandwiched...

After a conversation in a "For Sale" thread I thought we could continue it. I found it interesting to find out that factory HP 318 had a special attaching bolts. Makes me wonder if the trays were different also.