S&S CYCLE T124HC Series Engine 310-0900A

The S&S Cycle T124HC Series engine delivers genuine big-displacement performance for Dyna models, combining a 10.8:1 compression ratio with purpose-built internals engineered for sustained high-output riding. This is a complete long-block solution that puts professional-grade power in your hands without the guesswork of piecing together a build. Built in the USA with forged internals and specially machined cylinder heads, it's the foundation for serious street performance.

This engine comes ready for your fuel and ignition systems—meaning you retain full control over tuning and can spec components to match your exact performance targets. The Super Stock heads and high-flow oil pump support aggressive riding, while the offset intake flanges and repositioned breather locations ensure hassle-free fitment with stock-length manifolds and air cleaners.

• Displacement: 124 cubic inches
• Bore: 4-1/8"
• Stroke: 4-5/8"
• Compression ratio: 10.8:1
• Piston type: Forged flat-top
• Cam profile: 640
• Crankcase: CNC-machined
• Cylinder heads: Super Stock, specially machined
• Oil pump: High-flow design
• Finish: Powder coat
• Oil lines: Stainless steel
• Fitment: 2006-17 Dyna models
• Installation: Requires oil line kit
• Fuel system: Not included
• Ignition system: Not included
• Origin: Made in USA