S&S Twin Cam style crankcases are good news for engine builders who want to build Twin Cam TC88A style engines from scratch. S&S Twin Cam style crankcases feature greater overall strength than stock crankcases, especially in the front motor mount, an important consideration in high performance applications. All oil passages between the crankcase and gear cover are O-ring sealed. Timken style sprocket shaft bearing and S&S breather reed valve included. Cases are clearanced for strokes-5" and are compatible with stock components from 1999-2006 models, except 2006 Dyna. Use stock or aftermarket oil pump, cam support plate, gear cover, etc., and order the required oil line installation kit for your application as listed below.