S&S CYCLE T124 Series Engine 310-0400A

The S&S Cycle T124 Series Long Block delivers genuine street performance with a 10.8:1 compression ratio and 124 cubic inches of displacement—purpose-built for riders who demand power without compromise. This is a complete engine platform for serious Harley touring applications, engineered with S&S's proven reliability and backed by meticulous cylinder head machining that ensures seamless integration with stock-length intake manifolds. If you're running a 2007–'16 Touring model and want to move beyond bolt-on upgrades, this is the foundation that transforms your bike.

What You Need to Know Before Purchasing: This is a long block only—you'll need to source your own fuel system and ignition management (a quality aftermarket EFI tuner is essential for an engine this large). Installation requires a separate oil line kit. Not compatible with Softail, Tri-Glide, or three-wheel models. Two-year manufacturer warranty included.

• Displacement: 124 cubic inches
• Bore: 4-1/8"
• Stroke: 4-5/8"
• Compression ratio: 10.8:1
• Camshaft: S&S 640 Easy Start
• Piston type: Forged flat-top
• Crankcase & heads: Super Stock
• Oil pump: High-flow S&S TC3
• Head machining: Stock-length manifold compatible
• Breather locations: Stock-position mounting
• Finish: Black wrinkle powder coat
• Fitment: 2007–'16 HD Touring (non-Twin-Cooled)
• Installation: Requires separate oil line kit