Description
The S&S Cycle T143 Long-Block Engine delivers 143 cubic inches of displacement in a stock chassis—doubling the horsepower of factory big twins without frame modifications. Built for serious riders and racers who demand maximum performance, this ultra-high-output engine combines S&S’s precision engineering with aggressive valve timing and premium internals designed for sustained power delivery. Installation and tuning require technical expertise, and this engine prioritizes peak performance over everyday comfort, making it the ultimate bolt-in upgrade for 1999–2006 HD big twin platforms.
- 143 cubic inches displacement
- Fits stock chassis
- No frame cutting required
- S&S B3 cylinder heads
- CNC-machined ports
- Two-bolt exhaust flanges
- S&S Super Stock crankcases
- Reed breather valve
- Three-piece flywheels
- High-flow oil pump
- S&S 635 gear drive cams
- 1.725:1 rocker arms
- .674″ total valve lift
- Premium performance tappets
- Wrinkle black finish
- One-year warranty
- Requires oil line kit
- T143-specific exhaust needed
- Carb/intake sold separately
- Ignition system sold separately
- Incompatible with Softail models
- Incompatible with Dyna models
Wire transfer required to order. Does not ship free. Call to order 231-767-5055. Excluded from additional discounts.
