4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models - Wrinkle Black
4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models - Wrinkle Black
4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models - Wrinkle Black
4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models - Wrinkle Black

4" Sidewinder Big Bore Kit for 2007-'17 HD® Big Twin Models - Wrinkle Black

Regular price $1,154.95
Unit price  per 

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
Stroke Bore Cylinder Length Piston Type Dome Volume 83cc CNC Heads 85cc Stock Heads 89cc S&S Heads
4.375 4.00" 4.937" Forged .75 pop up 10.7:1 10.5:1 10.2:1

*Not compatible with S&S 79cc Super Stock® heads