Designed for high performance engines with cylinder bores between 4" and 4 3/8".

Fits

• 1984-'99 big twins with 4" bore and over
• S&S 4 3/8" bore: V126
• S&S 41/8" bore: V124, V111, V117
• S&S 4" bore: V100, V107, V113, V107T

Features and Benfits

• Cam chest is moved outward .250" to allow crankcases to handle large cylinder bore sizes
• Relocated cam chest oil pick-up increases gear case scavenging and virtually eliminates oil carry-over at sustained high speeds
• Machined to accept the stock oil filter assembly used on 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 achieved via two crankcase breathers, the cylinder heads, or both! We recommend using both crankcase breathers in engines larger than 95"
• Clearanced for strokes as long as 5"
• Machined for installation of a crank position sensor. This allows the cases to be used in EFI applications and also allows easy installation of S&S IST Ignition and VFI Fuel Injection. A plug kit is included for applications that do not use a crank position sensor