S&S CYCLE 106" Hot Set Up® Kit - 3.967" Bore - Wrinkle Black - Twin Cam 900-0354

106" Hot Set Up® Kit - 3.967" Bore - Wrinkle Black - Twin Cam Increased fin area for better heat dissipation, Increase bore size from 3.750" to 3.927", 4.375" stroke, 10.0:1 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 USA, EFI system must be recalibrated.