S&S Super Stock Alternator Style Crankcase for 1984-'91 Big Twins with Stock Bore - Wrinkle Black



Perfect for stock replacement and 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.
Features and Benefits:
  • 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 1984-'91 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"
  • Compatible with stock 1984-'99 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 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

  • Available for stock, 3 5/8", and 3 13/16" bore applications with deck heights as much as 3/16" taller than stock
  • Natural aluminum and wrinkle black powdercoat available

Crankcase Style Finish 3 1/2" Bore (Stock) 3 5/8" Bore 3 5/8" Bore (Small Diameter) 3 13/16" Bore Notes
1984-'91  Natural   31-0000*  31-0001   31-0072   31-0031   2, 3, 4
Black   31-0052**  31-0053  

The following OEM numbers are provided for reference only and may not be completely accurate.
Harley OEM Cross Reference Numbers:

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S&S Crankcase Assembly 31-0052

  • Brand: S&S Cycle
  • Product Code: 31-0052
  • Availability: Special Order
  • $1,825.95

Tags: S&S Cycle, Harley Davidson, Big Twin 1984-Up, Engine, Crank Case, Case Sets