S&S Cycle Crankcase - Stock Bore - Silver Finish - 31-0171

Greater overall strength than stock crankcases, especially in the front motor mount, an important consideration in high performance applications
All S&S crankcases use strong, dependable Timken style sprocket shaft bearings to stand up to the most demanding applications
Available in stock bore and 4-1/8in. bore
Clearanced for strokes up to and including 5in.
All passages between the crankcase cam support plate are O-ring sealed
Compatible with most stock components
Cam chest has clearance for up to .675in. lift cams
Includes the S&S crankcase breather reed valve for Twin Cam 88 engines designed to eliminate oil carry over and oil scavenging problems
Stock bore cases are perfect for replacement applications, 4-1/8in. 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. 4-1/8in. bore cases with stock stud pattern are ideal for the S&S 124in. Hot Set Up Kit for stock crankcases