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Even though the Y-block’s cooling ability was better than the flathead’s, it can still benefit from additional help, especially in the area where the two exhaust valves are close together. Here, Carlisle marks two cooling holes to be drilled between the middle two cylinders. Note that Carlisle is using a contemporary composite head gasket. The original head gaskets were tin, and therefore much thinner. Decking the block and the heads will make up for the compression lost to the thicker gaskets. Carlisle also told us that many of these blocks did not come flat from the factory, and he usually has 0.020 to 0.030 inch milled off the decks just to level them. View Related Article
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