100" Sidewinder Big Bore Kit for 1999-'06 HD® Big Twin Models - Wrinkle Black

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 liner
• 10.5:1 Compression
• Bolts in. No machining, balancing, or splitting the crankcases
• 88" engines are boosted to 100"
• Complete kits include cylinders, pistons, gaskets, and instructions
• Wrinkle black cylinders – matches stock finish
• Although 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.