Cometic Gasket EST Top End Gasket - 3.937in. Bore with .040in. MLS Head Gasket C9182 At Cometic Gasket, our goal has is to offer the&nbsp;latest in gasket technology Materials, manufacturing processes and gasket designs are constantly improving to match the higher level of performance for today's powerful V-Twin engines Cometic Gasket Kits for Harley Davidson models include every gasket, seal, washer, and o-ring needed for a complete overhaul When purchasing a Cometic gasket kit, you can rest assured that every component will be the best solution for your application EST kits are available in Complete Motor Kits and Top End Kits