S&S Cycle T143 Long-Block Engine Fits Harley-Davidson Twin Cam Dyna and Touring 1999-2017

S&S Cycle T143 Long-Block Engine Fits Harley-Davidson Twin Cam Dyna and Touring 1999-2017

The T143 is the largest S&S long-block that fits a stock Harley-Davidson Twin Cam chassis – an ultra-performance build that lifts a Twin Cam 88, 96, or 103 to 143 cubic inches. The kit requires the S&S B3 intake manifold and an installer with technical expertise for this race-grade configuration.

Key Features

• Complete 143 cubic-inch Twin Cam long-block assembly, the largest S&S long-block that fits a stock Twin Cam chassis
• S&S B3-compatible high-flow cylinder heads with S&S forged pistons in 143 cylinders
• S&S 635 cam grind in the appropriate platform-specific grind
• S&S TC3 oil pump and cam support plate
• S&S valve train with premium tappets, tappet cuffs, and pushrods
• Available in Wrinkle Black with Chrome, Silver (1999-2006 Big Twin only), Stone Gray (2007-2016 Touring only), or all-Black Edition finish
• Platform-specific variations cover 1999-2005 Dyna and 1999-2006 Touring (Twin Cam 88, excluding 2006 Dyna), 2008-2016 oil-cooled Twin Cam 96/103 Touring, and 2006-2017 Twin Cam 96/103 Dyna
• Required gaskets and seals to complete the installation are included
• One-year S&S warranty

Technical Specifications

• Displacement: 143 cubic inches
• Cylinder Heads: S&S B3-compatible high-flow
• Pistons: S&S forged
• Camshaft: S&S 635, platform-specific grind
• Oil Pump and Cam Plate: S&S TC3
• Valve Train: S&S premium tappets, tappet cuffs, and pushrods
• Required (sold separately): S&S B3 intake manifold
• Warranty: 1 year
• Country of Origin: United States

Fitment Notes

• Compatible with select 1999-2017 Harley-Davidson Twin Cam Dyna and Touring chassis only.
• 1999-2006 635 Cam variations fit 1999-2005 Dyna and 1999-2006 Touring with Twin Cam 88; the 2006 Dyna is excluded because it used the early-style Twin Cam 96 crankcase.
• 2007-2016 Touring 635 Cam variations fit 2008-2016 Touring with the oil-cooled Twin Cam 96 or 103 engine – the Touring fitment window begins 2008 because the T143 long-block requires the larger-bore-capable case found from 2008-Up.
• 2006-2017 Dyna 635 Cam variations fit 2006-2017 Dyna with the Twin Cam 96 or 103 engine.
• Excludes all Softail platforms and all Twin-Cooled Milwaukee-Eight configurations.
• The S&S B3 intake manifold is required for installation and is sold separately – the T143 needs the B3 to feed the 143 displacement.
• This is an ultra-performance build that requires installer technical expertise and an experienced rider; the installer also supplies the throttle body, exhaust, and ECM tune for the new 143 displacement.
• Refer to the Fitment tab for the full platform breakdown per variation.
• Not affiliated with or endorsed by Harley-Davidson.