Cometic offers head gaskets by part number listed in their catalog. They also offer "round" head gaskets that match the bore. Gaskets that are "round" don't have cut outs for valve notches but are made to match a specific bore. They're standard head gaskets (catalog part numbers) will be similar to the factory gaskets and match the valve notches or combustion chamber and be slightly larger than the specified bore size. This should be explained by the place one purchases their gaskets from so they are sure to sell you the correct part.
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