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Dual Piston Seals for leak proof operation
Machined with the S&S® 4" cylinder stud pattern
The 21" 180mm Wrap Fender is designed to fit a 180/50-21 tire
All of these parts are pre-drilled
110" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models - Silver SUPER BRIGHT HALO RINGS Dual Piston Seals for leakInspired 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 youll need to complete the installation. The biggest cylinder bore that can be installed in a stock crankcase without machining! Features & Benefits Low friction Ductile
