Crankshafts

Building massive power reliably just got easier! Our new MK-Series B Crankcases can be paired with our 136" cylinder kit and 4 5/8" Stroker Crank to give you a rock-solid build. These cases scrape more oil than the stock ones, have a large volume sump,...

The demand for performance-based bagger parts is growing, and these M8 engines are creating more power daily. All that power requires a quality base that the stock cases can't provide. That's where the new S&S M8 Crankcases come in! Designed to allow for...

S&S Cycle Crankcase Oil Screen - 5 Pack

Crankcase Oil Screen for 1948-1999bt

This 4-1/8" wrinkle black, stock stud pattern crankcase for 1999-'06 HD® Twin Cam 88®A engines (except 2006 HD® Dyna®) is much stronger than stock crankcases in every aspect. It has an extra large front motor mount for increased strength. The large cam...

This 4-1/8" wrinkle black S&S® stud pattern crankcase for 1999-'06 HD® Twin Cam 88®A engines (except 2006 HD® Dyna®) is much stronger than stock crankcases in every aspect. It has an extra large front motor mount for increased strength. The large cam...

Build your engine on a strong, dependable foundation with the S&S Cycle Black Stock Bore Alternator Crankcase Assembly. Engineered for lasting durability and precise fitment, this crankcase delivers a reliable core for your motorcycle's engine components...

The S&S Cycle Crankcase Baffle Plate is designed for 1999 and later Big Twin models to strengthen your Harley-Davidson's engine performance. The baffle plate helps manage crankcase pressure, pormoting efficient oil circulation and reducing the risk of...

S&S Cycle 92-99 BT w/ 3-5/8 Bore Super Stock Alternator Style Crankcase - Wrinkle Black

Perfect for stock replacement and high performance applications, these crankcases offer some unique features. Besides being machined for a crank position sensor, they are also compatible with stock flywheel assemblies, primary covers, gearcovers and are...

Perfect for stock replacement and high performance applications, these crankcases offer some unique features. Besides being machined for a crank position sensor, they are also compatible with stock flywheel assemblies, primary covers, gearcovers and are...

A ported breather passageway and a machined breather window allows the air/oil mist to flow from the flywheel cavity to the cam chest of the engine with the least possible restriction