4" Sidewinder Big Bore Kit for 1999-'06 HD<sup>®</sup> Big Twin Models - Wrinkle Black
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4" Sidewinder Big Bore Kit for 1999-'06 HD® Big Twin Models - Wrinkle Black

4" Sidewinder Big Bore Kit for 1999-'06 HD® Big Twin Models - Wrinkle Black

Item #: 910-0646
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1 review | Write a Review
$1,154.95

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!

Features & Benefits

  • Low friction Ductile Cast Iron liner
  • 10.5:1 Compression
  • Bolts in. No machining, balancing, or splitting the crankcases
  • 88" engines are boosted to 100"
  • 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    4.00" 4.937" Forged 8.75 pop up 10.8:1 10.5:1 10.1:1

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

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Disclaimer

NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. Not legal for sale or use on any EPA pollution