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®)
- Choose Silver, Black, or Polished Finish
Silver. . . . 106-4057
Black. . . .31-0181
Polished. . . .31-0182
