S&S Cycle 99-06 BT 4-18in Bore Crankcase - Silver

Part #: 106-4043A

This crankcase is intended to replace the crankcases in HD (R) Twin Cam 88 (R) engines in existing HD (R) chassis only. S&S stock style crankcases have a rear motor mount that bolts directly to the stock 1999-'06 transmission for all models except 2006 HD (R) Dyna (R). These crankcases are compatible with the stock primary, charging system, and other stock components. S&S replacement crankcases are not available for HD (R) Twin Cam 88B (TM) or 2007-'16 HD (R) Twin Cam 96 (TM) or HD (R) Twin Cam 96B (TM) engines. Stock bore cases are perfect for replacement applications, 4" bore cases are a natural for use with the S&S Super Sidewinder (R) Hot Set Up Kits (R), and 41/8" bore cases make really large displacement custom engines possible, and are available with the S&S cylinder stud pattern or with the stock cylinder stud pattern. 41/8" bore cases with stock stud pattern are ideal for the S&S 124" Hot Set Up Kit (R) for stock crankcases.