S&S Cycle #910-0642 - 4" Big Bore Bolt-In Sidewinder® Cylinder Kit - 100" - Silver

Inspired by our Pro Stock Drag Race engines, these updated big bore kit utilizes a Ductile Cast Iron liner wrapped in cast aluminum for optimum thermal conductivity and performance. Bolt-in kits do not require machining, rebalancing or engine removal, and include just about everything you’ll need to complete the installation. The biggest cylinder bore that can be installed in a stock crankcase without machining!
Features & Benefits
Low friction Ductile Cast Iron liner10.5:1 CompressionBolts in. No machining, balancing, or splitting the crankcases88" engines are boosted to 100"Complete kits include cylinders, pistons, gaskets, and instructionsWrinkle black cylinders – matches stock finishAlthough not mandatory, we recommend adding an oil cooler to bikes ridden in warmer climates









Stroke



Bore



Cylinder Length



Piston Type



Dome Volume



83cc CNC Heads



85cc Stock Heads



89cc S&S Heads









4



4.00"



4.937"



Forged



8.75 pop up



10.8:1



10.5:1



10.1:1






*Not compatible with S&S 79cc Super Stock® heads. Not recommended for Tri-Glide or other three wheel models due to lugging nature of these bikes.

Fitment

Year(s)	Make	Model Code	Model
1999-2006	Harley-Davidson	—	Big Twin