S&S Cycle Special Application Crankcase for 1984-1999 Harley-Davidson Evolution Big Twin
Standard Evolution crankcases weren’t designed for 4 inch bore cylinders or 5 inch stroker flywheels, and that’s exactly where this S&S special application case steps in. The cam chest is moved outward to accommodate large bore sizes, the oiling system is redesigned for sustained high-RPM use, and the case accepts a crank position sensor for EFI compatibility – all while maintaining the external dimensions that fit into 1984-1999 Harley-Davidson frames.
Key Features
- Cam chest moved outward .250 inch to accommodate large cylinder bore sizes including 4 inch and 4.125 inch
- Clearanced for stroker flywheels up to 5 inch stroke
- Relocated cam chest oil pick-up eliminates oil carry-over at sustained high RPM
- Ported breather passageway and machined breather window for reduced restriction
- Machined for crank position sensor installation – EFI and S&S IST Ignition compatible
- Accepts stock 1992-1999 oil filter assembly
- Made in the USA by S&S Cycle
Technical Specifications
- Cam Chest Offset: .250 inch outward
- Max Stroke Clearance: 5 inches
- Bore Compatibility: S&S 4 inch and 4.125 inch V-Series engines
- Oil Filter: Accepts stock 1992-1999 Big Twin oil filter assembly
- Breather Options: Two crankcase breathers, cylinder heads, or both (S&S recommends both for engines over 95″)
- EFI Compatibility: Machined for crank position sensor
- Fitment: 1984-1999 Harley-Davidson Evolution Big Twin
- Origin: Made in USA
Fitment Notes
- Fits 1984-1999 Harley-Davidson models with Evolution Big Twin engines
- Also compatible with S&S 4 inch and 4.125 inch V-Series engine builds
- For engines over 95 cubic inches, S&S recommends using both crankcase breathers for adequate venting
- Crank position sensor installation allows use with EFI and S&S IST Ignition and VFI Fuel Injection
- Review the Fitment tab for the complete year and model breakdown
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