S&S Cycle 99-06 BT 4in Bore 4in Stroke Cylinder Kit - Wrinkle Black w/ Highlight

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!

• Although not mandatory, we recommend adding an oil cooler to bikes ridden in warmer climates
• Complete kits include cylinders, pistons, gaskets, and instructions
• Bolts in. No machining, balancing, or splitting the crankcases
• Wrinkle black cylinders - matches stock finish
• Low friction Ductile Cast Iron liner
• 88" engines are boosted to 100"
• 10.5:1 Compression