Alternator Style Crankcase Assembly with 3-1/2in. Bore – Black. Fits Big Twin 1984-1991.

Product Details









Features & Benefits:-* Wrinkle Black.* Perfect for stock replacement & 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 clearanced for 38 amp alternator stators.* Relocated cam chest oil pick-up increases gear case scavenging & virtually eliminates oil carry-over at sustained high speeds.* Machined to accept the stock oil filter assembly used on Big Twins 1984–1991.* A ported breather passage way & 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 95ci.* Clearanced for strokes as long as 5in.* Compatible with stock 1984-1999 flywheel assemblies, primary covers, gearcovers, and clearanced for 38 amp alternator stators, making them perfect for stock replacement or high performance applications.* Machined for installation of a crank position sensor. * This allows the cases to be used in stock EFI applications & also allows easy installation of S&S IST Ignition & VFI Fuel Injection. * A plug kit is included for applications that do not use a crank position sensorTech Tips:-* S&S Crankcase # SS31-0052 directly replaces H-D # 34473-85A.* Use 1984-1991 style oil pump.* Machined for 1984-1999 alloy primary.* Machined for stock or S&S EFI crank position sensor. Stock diameter only. Proudly Made in the USA by S&S Cycle !
MFR PART No: 31-0052

ROLLIES PART No: SS31-0052






Download Product information ( PDF)