These 4-1/8 inch bore crankcases have the stock bolt pattern. For use with S&S 4-1/8 inch bore cylinders such as the S&S 124 Hot Set Up Kit®. Compatible with the stock primary, charging system and all other stock components and bolt directly to the stock transmission on all models.
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 1/8" Bore (Stock Stud Pattern)
- 1999 - 2006 Big Twins (except 2006 Dyna®)
Oil Line Kit Required
- Silver Powder Coat Finish