BESTgasket is the world's premier manufacturer of gaskets for vintage and classic American cars and trucks. BEST Gasket complete/full gasket set for "big bore" 1949-1953 Ford and Mercury passenger car models and 1948-1953 Ford truck models using the 239ci or 255ci flathead V-8 engine with distributor mounted at perpendicular angle to the camshaft. P/N RS536G; head gasket bore is 3.440". We offer head gaskets and gasket sets for smaller bore blocks. This gasket set is for late-design flathead V-8 engines which have the distributor mounted at a perpendicular angle to the camshaft; compared to early-design where the distributor is driven directly off the forward end of the camshaft. BEST Gasket is the leading name in sealing performance in the restoration industry.