James, cylinder head & base gasket kit. MLS/RCM 4-1/8" bore

4-1/8" bore. Kit to service one engine. With MLS head gaskets and .022" (final crush .020") RCM (Rubber Coated Metal) base gaskets. MLS explained: MLS (Multi Layer Steel) is used in high performance head gasket applications. They consist of multiple layers of steel uniquely designed and riveted together, outside the gasket surface for ease of installation, and provedes a high performance seal. MLS head gaskets eliminate the use of dowel pin o-rings. RCM explained: RCM (Rubber Coated Metal) gaskets consists of a .020" thick stainless spring steel base covered with a .001" thick heat resistant Viton rubber on both sidesand a silicone bead. A very strong gasket which requires no re-torquing. MULTI LAYER STEEL HEAD & STEEL BASE RUBBER COVERED DUAL SIDED SILICONE BASE GASKETS; 4 1/8" BORE

Fits: > 84-17 S&S 4-1/8" engines (excl. Twin Cooled)