BESTgasket is the world's premier manufacturer of gaskets for vintage and classic American cars and trucks. BEST Gasket intake and exhaust manifold gasket set for 1937-1954 Chrysler and DeSoto models and 1937-1968 Dodge truck models using a 218ci, 228ci, 237ci, 241ci, 251ci, or 265ci flathead 6-cylinder engine with a 25" overall length cylinder head. P/N 12031. BEST Gasket is the leading name in sealing performance in the restoration industry.