These 4 inch bore crankcases have the stock bolt pattern for use with S&S 4" bore cylinders. Compatible with the stock primary, charging system and all other stock components and bolt directly to the stock transmission on all models.
Features and Benefits
- Much stronger than stock crankcases, extra large
front motor mount for increased strength
- Large cam chest allows cam lift up to .675" without clearancing
- Timken® style sprocket shaft bearings withstand the most demanding applications
- Includes S&S crankcase breather reed valve to eliminate oil carry-over and oil scavenging problems
- Clearanced for strokes up to 5"
- All passages between crankcase cam support plate are o-ring sealed
- Includes pinion bearing
- 4" Bore (Stock Stud Pattern)
- 1999 - 2006 Big Twins (except 2006 Dyna®)
Oil Line Kit Required
Silver finish
Also available in Black finish 31-0175
