BESTgasket is the world's premier manufacturer of gaskets for vintage and classic American cars and trucks. BEST Gasket valley/pushrod cover gasket set for 1957-1958 Oldsmobile models and 1957-1959 GMC models with the 371ci (370ci) V-8 engine; including J-2 engines. P/N 19019E. BEST Gasket is the leading name in sealing performance in the restoration industry.