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

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 as5in.

* 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 sensor

* Upgrade on OEM # 24469-83 / 24473-83 / 24473-85

Tech 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 !