3-5/8" big bore. Kit to service one engine. With .045" firering head (.042" final crush) & .020" RCM (Rubber Coated Metal) base gaskets. The use of o-rings is not required due to head gasket design. James' RCM gaskets consists of a .020" thick stainless spring steel base covered with a .001" thick heat resistant Viton rubber on both sides. A very strong gasket which requires no re-torquing. Gaskets will not become brittle or burn out.
Fits: > 84-99 Evo Big Twin; 86-22 Evo XL Sportster (Excl. XR1200). With 3 5/8" big bore cylinders (NU)
