S&S CYCLE T111 Long Block Engine - Twin Cam 310-0770A

If you've already invested in performance upgrades for your stock engine, the S&S Cycle T111 Long Block lets you preserve those investments while stepping up to genuine big-inch power. This complete engine assembly delivers the displacement and compression you need to maximize the carburetor, EFI system, and ignition components already on your bike—no need to start over. Purpose-built with specially machined cylinder heads that accept stock-length intake manifolds, it's the intelligent path to serious performance without redundant spending.

The T111 combines S&S's proven engineering with forged flattop pistons, easy-start cams, and a high-flow oil pump in a wrinkle black finish that demands attention. At 4-1/8 bore × 4-1/8 stroke with a 9.8:1 compression ratio, this long block delivers the displacement gains you're after—and the cylinder head geometry is tailored to work seamlessly with your existing fuel and ignition systems. Perfect for 1999–2005 Harley-Davidson big twins (excluding Softails), it's the foundation for a truly custom, high-performance engine build.

• S&S super stock heads
• Forged flattop pistons
• Easy-start cams included
• High-flow oil pump
• 4-1/8" bore × 4-1/8" stroke
• 9.8:1 compression ratio
• Wrinkle black finish
• Fits stock manifolds (410 size)
• Stock breather spacing
• Accepts existing carb/EFI
• Fuel and ignition not included
• 1999–2005 big twins compatible
• Not Softail compatible
• CNC-machined heads
• Bolt-on ready