S&S Cycle 99-06 Twin Cam 88 A Engines 4-1/8in Bore Stock Stud Pattern Crankcase - Wrinkle Black

This is the S&S Cycle 4-1/8 inch bore crankcase, finished in wrinkle black, designed for 1999 through 2006 Harley-Davidson Twin Cam 88A engines. It's built to be significantly stronger than the stock crankcase in all areas, offering a solid foundation for your engine build. The extra-large front motor mount adds considerable strength, and the generous cam chest is clearanced for cam lifts up to .675 inches without needing modification. This means you have more flexibility when choosing performance cams for your build.

Inside, you'll find Timken-style sprocket shaft bearings, known for their ability to handle high-stress situations. The S&S crankcase breather reed valve is a smart addition that helps prevent oil carry-over and scavenging issues, keeping your engine running cleaner. This crankcase is also clearanced to accommodate strokes up to 5 inches, giving you room for significant displacement increases. All the passages connecting the crankcase to the cam support plate are sealed with O-rings, ensuring proper oil flow and preventing leaks.

When you get this crankcase, it comes as a complete kit. You'll find the S&S crankcase itself, the S&S breather reed valve, a pinion and Timken bearing, and all the necessary hardware to get started. This comprehensive package means you have the core components ready for your engine assembly.