S&S Natural Crankcase 4-1/8" Bore And Small Diameter Flywheels

Features

• Designed for high-performance engines with cylinder bores between 4″ and 4-3/8″
• Cam chest is moved outward .25″ to allow crankcase to handle large cylinder bore sizes
• Relocated cam chest oil pick-up increases gear case scavenging and eliminates oil carry-over at sustained high speeds
• Machined to accept the stock oil filter assembly for 1992-99 Big Twins
• 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
• Crankcase venting can be done with the two crankcase breathers, the cylinder heads, or both
• In engines larger than 95″, it is recommended to use both crankcase breathers
• Clearanced for strokes as long as 5″
• Machined for installation of a crank position sensor, which allows the cases to be used in EFI applications
• A plug kit is included for applications that do not use a crank position sensor
• All crankcases do not have interlock groove and ring and do not use case alignment studs
• Case mating surface is flat and the cases are aligned with alignment dowels