C9989 Cylinder base gasket set. RCS 3-5/8" big bore

If you are running a 1948–1965 Panhead with S&S 3-5/8" big bore cylinders, standard gaskets just won't cut it. This Cometic cylinder base gasket set is sold as a pair, providing the front and rear gaskets needed for one engine. These are manufactured from .020" thick Rubber Coated Steel (RCS), which features an embossed steel core with a nitrile rubber coating on both sides. This design provides the structural integrity and heat resistance required for big bore applications, ensuring a reliable seal between the cylinders and the crankcase. It is a must-have for any mechanic building or maintaining a high-performance vintage Panhead who demands better sealing than traditional paper or fiber gaskets can offer.