BESTgasket is the world's premier manufacturer of gaskets for vintage and classic American cars and trucks. BEST Gasket timing cover gasket set for late 1963-1967 Pontiac 326ci, 389ci, and 421ci V-8 engines and late-1963 Pontiac 195ci 4-cylinder engines with a rubber front crankshaft seal. P/N GS9071Z. BEST Gasket is the leading name in sealing performance in the restoration industry.