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

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 5″

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