S&S Cycle - 4" Sidewinder Big Bore Kit for 2007-2017 HD Big Twin Models - Wrinkle Black

Inspired by S&S Cycle 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:

• Low friction ductile cast iron liner
• 10.5:1 compression
• Bolts in. No machining, balancing, or splitting the crankcases
• 96" and 103" engines are boosted to 110"
• Complete kits include cylinders, pistons, gaskets, and instructions