Cometic, cylinder base gasket set. RCS 3-5/8" big bore

63-65 Panhead; 66-84 Shovelhead. With 3-5/8" big bore cylinders (NU)

Front & rear gasket for one engine. .020" thick RCS (Rubber Coated Steel), an embossed steel core with a .001" thick coating of heat resistant nitrile rubber on both sides.