S&S Cycle 31-0172A Twin Cam Engine Case - Stock Bore

Replacement Twin Cam A engine cases for stock H-D chassis only (carb and EFI). Feature greater overall strength than stock crankcases. Strong, dependable Timken-style sprocket shaft bearings. 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. Include S&S crankcase breather reed valve designed to eliminate oil carry-over and oil scavenging problems. Rear motor mount bolts directly to the stock transmission; fully compatible with the stock primary, charging system, and other stock components. Available with stock bore (ideal for replacement applications), 4in bore (ideal for use with the S&S Super Sidewinder Hot Set Up Kits), and 4 1/8in bore engines with stock or S&S cylinder stud pattern (ideal for custom applications and for use with the S&S 124in Hot Set UpKit). Available with silver powder-coat or black powder-coat. Made in the USA.