See more: ENGINE GROUP - ENGINE PERFORMANCE KITS
106" Hot Set Up® Engine Performance KitIncreased 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. Not for Twin Cooled.