S&S CYCLE T143 LONG BLOCK ENGINES- Touring | Dyna | FXD

Unlock the ultimate in street performance with this high-displacement long block engine, engineered for riders who demand massive power without sacrificing the integrity of their motorcycle's frame. Designed to bolt directly into a stock chassis, this powerhouse requires no cutting or frame modifications, providing a seamless upgrade path for high-performance builds.

At the core of this engine are S&S B3 cylinder heads, CNC-machined with two-bolt exhaust flanges for superior flow. The internal assembly features S&S Super Stock™ T2 crankcases equipped with a reed breather valve and three-piece flywheels. For precision timing and lift, it utilizes S&S 635 easy-start gear drive cams paired with 1.725:1 rocker arms, achieving a total lift of .674".

Premium Components & Technical Specifications:

• High-Flow Management: Equipped with an S&S high-flow oil pump, TC3 oil pump, and cam plate for consistent lubrication and cooling.
• Valvetrain: Includes premium high-performance tappets and easy-start cams for reliable ignition and operation.
• Optimized Compression: High-compression ratios ranging from 10.5:1 to 10.8:1 for maximum torque and horsepower.
• Breathability: Features a stock-style breathing system compatible with most performance air cleaners; breather vent bolt locations are adjusted to stock positions for easy installation.
• Precision Machining: Cylinder heads are specially machined to compensate for non-stock cylinder length, ensuring compatibility with stock-length intake manifolds and throttle bodies.

Installation & Compatibility Notes:

This engine is designed for versatility across multiple chassis types. Please note that a specific or custom exhaust is required for operation. While the long block includes the primary rotating assembly and heads, it does not include the fuel system, intake, or ignition system, allowing you to customize your setup to your specific performance goals. For owners of 2006 models, a set of 99-05 style offset intake flanges will be required. Additionally, revised oil routing on select models eliminates the need for external oil line installation kits.

Proudly made in the USA, this engine represents the pinnacle of American V-Twin engineering, delivering track-level performance for the street.