BESTgasket is the world's premier manufacturer of gaskets for vintage and classic American cars and trucks. BEST Gasket exhaust manifold gasket set for 1955-1956 Pontiac and GMC models using a 287ci (288ci) or 316ci Pontiac-designed V-8 engine. P/N 19029E. BEST Gasket is the leading name in sealing performance in the restoration industry.