S&S Cycle 124 Inch Cylinder and Piston Kit for 2007-2017 Harley-Davidson Twin Cam
Displacing a Twin Cam engine to 124 cubic inches transforms the character of the entire motorcycle – deeper torque, a broader powerband, and the kind of thrust that makes every throttle input count. This kit delivers forged pistons, matched cylinders, and a complete gasket package engineered to work with the stock cylinder head bolt pattern, so the 124-inch conversion stays manageable without sacrificing any of the displacement gains.
Key Features
- Complete 124 cubic inch big bore conversion kit for 2007-2017 Twin Cam engines
- Forged pistons with 10.9cc dished design achieve 10.6:1 compression with stock 85cc cylinder heads
- 4.625 inch stroke with stock-compatible head bolt pattern for simplified installation
- Includes forged pistons, pins, clips, rings, cylinders, head gaskets, base gaskets, and exhaust gaskets
- Made in the USA by S&S Cycle
Technical Specifications
- Displacement: 124 cubic inches
- Stroke: 4.625 inches
- Piston Design: 10.9cc dished forged pistons
- Compression Ratio: 10.6:1 with stock 85cc cylinder heads
- Head Bolt Pattern: Stock compatible
- Included: Forged pistons, pins, clips, rings, cylinders, head gaskets, base gaskets, exhaust gaskets
- Fitment: 2007-2017 Harley-Davidson Twin Cam engines
- Origin: Made in USA
Fitment Notes
- Fits 2007-2017 Harley-Davidson models equipped with the Twin Cam engine
- Crankcase machining required – not a bolt-on conversion
- Compatible with stock cylinder heads or S&S cylinder heads with stock bolt pattern
- Recommend upgrading head bolts for all big bore installations – see S&S Cycle cylinder stud and head bolt kits
- Review the Fitment tab for the complete year and model breakdown
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