S&S CYCLE 106" Hot Set Up® Engine Performance Kit Black 9000354

Increased fin area for better heat dissipation. Increase bore size from 3.750" to 3.927". 4 3/8" stroke, 10:1 compression with stock heads. Easy installation; no machining or rebalancing required. Forged coated pistons are compatible with stock or S&S Super Stock 79cc and 89cc heads. Valve pocket recessed in S&S pistons are enlarged for oversize valves and higher lift cams. 11 fins and full fin pattern on cam side of cylinders closely resembles OEM shape. Kit includes; S&S cylinders with gaskets, piston set with rings, top end gasket kit, pushrods, tappets, 585CE chain-drive easy start cams and instructions. A fuel system is not included. Made in the U.S.A.