S&S Cycle Bolt-In Sidewinder® Big Bore Kits — 4" bore, 110" displacement, 4-3/8" stroke, 10.5:1 compression

The Bolt-In Sidewinder® Big Bore kit installs without machining, balancing, or splitting the crankcases — installation can be performed with the engine in the frame.

Cast ductile iron sleeves are located in cast aluminum for superior heat transfer and long-term durability.

Delivers a noticeable increase in displacement for improved torque and roll-on power, while remaining streetable and responding well to performance cams.

• Complete kit includes cylinders, forged pistons, rings, piston pins, clips and gaskets.
• Not for use with certain 79cc heads.
• Not recommended for trike models or Twin Cooled models.