Sherman's Small Block Hybrid - Big-Inch Mice In Two Distinct Flavors Photo Gallery
Sherman likes Cometic head gaskets because the company will make any size in any thickness. This gasket is 0.030-inch thick and the cylinder bore is 4.125. He uses a bigger bore gasket so its edge does not interfere with intake flow or combustion. Ditto on the upper edge of each cylinder at the deck. A sharp edge can indeed interfere with the horsepower process at high rpm.