See more: Special & Big Bore Gaskets
Base gaskets 3 5/8", Steel, Evolution Big Twin 1984-1999 and Sportster 1984 to present (OEM 16777-94)
Europe's leading gasket manufacturer Athena offers specific gaskets for specific needs. In addition to the complete gasket kits they offer Big Bore head and base gaskets for 3 5/8" bore cylinders. These gaskets are sold in sets of 2.