S&S CYCLE T124 Series Engine 310-0831A

The S&S Cycle T124 Series engine delivers the displacement and compression ratio your build needs to compete on the street. Rather than nursing a tired stock engine along, this all-new long block gives you genuine power gains and the reliability of purpose-built internals—backed by a 2-year warranty. With easy-start cams, high-flow oil circulation, and factory-matched cylinder head machining, you get bolt-in performance without compromise.

This engine is engineered specifically for Harley applications that demand real horsepower and torque. The 10.8:1 compression ratio optimizes fuel ignition for street performance, while the 124-cubic-inch displacement provides the displacement advantage that separates this build from stock. Super Stock heads come pre-machined to work seamlessly with stock-length intake manifolds (S&S manifold size 410), eliminating fitment headaches and compatibility concerns.

Installation is straightforward for anyone comfortable with engine replacement on their platform. The breather vent locations are positioned at stock height, and the specially machined cylinder heads accommodate standard air cleaner back plates without modification. Note: T-Series engines are not compatible with HD Softail models. If your bike is a 2006 or later model, verify that you have 99–05 style offset intake flanges for compatibility.

• Displacement: 124 cubic inches
• Bore: 4-1/8"
• Stroke: 4-5/8"
• Compression: 10.8:1 ratio
• Cam: 640 gear drive
• Piston: Forged flat-top
• Heads: Super Stock
• Rocker arms: S&S forged
• Oil pump: High-flow
• Warranty: 2 years
• Made in USA