S&S CYCLE Motor Install Kit - Black - FXD 310-0870

If you're serious about street performance, the S&S CYCLE Motor Install Kit delivers the displacement and compression ratio that separates genuine power from promises. This 124-cubic-inch engine combines purpose-built internal components with street-friendly engineering, designed to bolt into your FXD platform without requiring a complete fuel or ignition system overhaul. The Black Edition aesthetic pairs aggressive performance with a refined look that doesn't compromise on what matters—real horsepower and reliability.

What sets this engine apart is the attention to detail in the cylinder head machining. S&S engineered these heads to work seamlessly with stock-length intake manifolds, meaning you're not forced into expensive custom fabrication. The high-flow oil pump and easy-start cam profile keep things manageable for street riding while the 10.8:1 compression ratio ensures you're extracting maximum performance from modern fuel.

• Displacement: 124 cubic inches
• Bore: 4 1/8"
• Stroke: 4 5/8"
• Compression ratio: 10.8:1
• Piston type: Forged flat-top
• Camshaft: 640 profile
• Cylinder heads: Super Stock, 99-05 style
• Oil pump: High-flow design
• Air system: Stock-compatible breathing
• Finish: Gloss black covers
• Fitment: FXD applications
• Installation: Bolt-on engine
• Origin: Made in U.S.A.
• Note: 06+ models require offset flanges