S&S Cycle 124in. Hot Set Up Kits with Heads 900-0568 The S&S Hot Setup kit for Twin Cams allows a Twin Cam owner to convert a stock 88in. engine to 124in. using the stock crankcases Include 4 1/8in. bore cylinders and forged dished pistons, an S&S 4 5/8in. stroke flywheel assembly, a set of S&S .640in. lift chain-drive Easy Start cams, tappets, S&S Quickee adjustable pushrods, roller rocker arms, and all hardware, gaskets and instructions 10.4:1 compression ratio with stock cylinder heads; 10.2:1 compression ratio with S&S 89cc heads, sold separately Fuel system is not included Black or silver powder-coat finish