This crankcase is intended to replace the crankcases in HD^? Twin Cam 88^? engines in existing HD^? 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^? Dyna^?. These crankcases are compatible with the stock primary, charging system, and other stock components. S&S replacement crankcases are not available for HD^? Twin Cam 88B^? or 2007-'16 HD^? Twin Cam 96^? or HD^? Twin Cam 96B^? engines. Stock bore cases are perfect for replacement applications, 4" bore cases are a natural for use with the S&S Super Sidewinder^? Hot Set Up Kits^?, 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^? for stock crankcases.

Instructions:
Instruction Sheet
Instruction Sheet 2