S&S Cycle - 4" Sidewinder Big Bore Kit for 1999-2006 HD Big Twin Models - Silver

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. This is the biggest cylinder bore that can be installed in a stock crankcase without machining!

Features

• Bolt in - no machining, balancing or splitting the crankcases; install can be performed with engine still in frame
• Cast Ductile Iron Sleeve in cast aluminum for superior heat transfer
• 88" engines are boosted to 100"
• 96" and 103" engines are boosted 110"
• 10.5:1 compression (w/ stock 85cc heads) makes for a very streetable and dependable engine that also responds well to performance cams
• Complete kits include cylinders, forged pistons, rings, piston pins, clips and gaskets
• Not for use with S&S 79cc heads
• Bore size 101.6MM
• Stroke Length 4"
• Displacement 100"