BESTgasket is the world's premier manufacturer of gaskets for vintage and classic American cars and trucks. BEST Gasket valve cover gasket set for the following applications: 1951-1955 Chrysler 331ci HEMI V-8 / 1956 354ci HEMI V-8 / 1957-1958 Chrysler 392ci HEMI V-8 - P/N 20070E. BEST Gasket is the leading name in sealing performance in the restoration industry.