S&S Cycle 106 Hot Set UP Kit For Harley Twin Cam Take your Twin Cam build to the next level with the S&S 106 Hot Set Up Kit. S&S has a long-standing reputation in the Harley performance market, making this kit an option for riders planning an engine upgrade with components from an established name. Features: Up to 25hp increase! No crank case modification required, Use your stock flywheel S&S Cycle Easy Start 585 chain camshafts S&S Cycle adjustable pushrods are made from high strength tubing Flat top pistons with enlarged recess area for high lift camshafts and over size valves For use with stock 85cc heads, provides compression ratio of 10.0:1 .045 MLS head gaskets included Maintains stock engine height 4.937 Cylinder length Made in the USA Note: Does not fit Twin Cooled models.