S&S Cycle – Silver 100″ Bolt-In Sidewinder® 4″ Big Bore Kit fits ’99-’06 Twin Cam Engines
This Big Bore Kit has a 10.5:1 compression ratio (W/ stock 85cc heads) that will transform your engine into a street-ready and reliable machine which will respond well to performance cams. It is also a bolt-in kit that requires no balancing, matching or splitting of the crankcases. Furthermore, it can be installed with the engine still in frame. This kit comes complete with cylinders, forged pistons, rings, piston pins, clips and gaskets.
Features
- Cast Ductile Iron Sleeve in cast aluminum for superior heat transfer
- 88″ engines are boosted to 100″
- Made in the U.S.A.
NOTES: Not for use with S&S 79cc heads.





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