Moose Racing Standard/High-Compression Top-End Gasket Set 0934-7199Performance sets designed for a piston replacement Includes every gasket, O ring and seal required to rebuild a top end; valve seals, head, base, exhaust, tensioner, and other misc. gaskets and O rings Does not include formed rubber valve cover gasket Formed valve cover gaskets are included in complete kit with oil seals High compression kits use . 012in. thick base gaskets to raise compression Cost effective way to raise compression without expensive