S&S Cycle

1984–'99 big twins

1984–1999 Evolution ® 1926–1984 Vintage Engines Tools & Shop Supplies Warranty & Company Policy Appendix & Index

SPECIAL APPLICATION CRANKCASES FITMENT • 1984–’99 big twins—4" bore and over • S&S 4", 41/8" bore V-Series engines FEATURES AND BENEFITS • 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 rpm • 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

KIT CONTENTS • Crankcase assembly • All required hardware, fittings, and bearings

NOTE: All S&S crankcases manufactured after June 1, 2008 do not have case interlock groove and ring and do not use case alignment studs. Case mating surface is flat, and cases are aligned with alignment dowels.

REPLACEMENT PARTS: SEE PAGE 74

SPECIAL APPLICATION ALTERNATOR CRANKCASES FOR 1984–'99 BIG TWIN ± Crankcase Style Bore Deck Height Natural

Wrinkle Black

Polished

–

1984–'99*

4"

5.875"

31-0047 USA 2 31-0033 USA 3

31-0051 USA 2 31-0037 USA 3

1984–'99*

4 1/8"

6.000"

31-0039 USA 3

31-0015**

31-0015**

31-0015**

Special Order

Specify Specify

*1992-'99 style oil pump, machined for 1984-'99 alloy primary, machined for stock or S&S EFI crank position sensor. Stock diameter only. **Special Order: Download the Special Order Form at sscycle.com/soforms ± WARNING:CancerandReproductiveHarm–www.P65Warnings.ca.gov

31-0033

35