Feature a greater overall strength than stock cases, especially in the front motor mount area Timken style sprocket shaft bearings Clearanced for strokes up to and including 5" All passages between the crankcase cam support plate are O-ring sealed The cam chest has clearance for up to .675" lift cams They include the S&S crankcase breather reed valve for Twin Cam 88 engines designed to eliminate oil carry-over and oil scavenging problems Stock stud pattern