4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models - Wrinkle Black
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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
96 and 103" engines are boosted to 110"
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