T143 Dragon

T143 Engines for 1999-'17 Big Twins

All joking about size aside, it does matter. The S&S T143 Long Block engine for Harley- Davidson® models is the largest S&S engine that will fit in a stock Harley- Davidson® chassis. It’s big, 143 cubic inches. ‘Nuff said. At double the HP of a stock motor the power of the T143 requires technical expertise for the installation and tuning along with an experienced rider. This is an ultra performance/ race engine. Longevity, engine noise, vibration and throttle sensitivity have all been compromised to reach this level of performance while fitting in a stock chassis and as such is not suitable for every situation. It is the purchaser's responsibility to consider the suitability for their application. Engine noise and damage from abuse is not covered under warranty.

The BIGGEST, BADDEST, BOLT-IN for a Stock Frame.


  • 1999-'16 Harley-Davidson® touring models
  • 1999-17 Dyna® models

Features & Benefits

  • Fits in stock chassis – no cutting or frame modifications
  • S&S B3 cylinder heads CNC machined with 2 bolt exhaust flanges
  • S&S Super Stock T2 Crankcases with reed breather valve
  • 3 Piece Flywheels
  • S&S high flow oil pump and cam cover
  • S&S 635 Easy Start Gear Drive Cams and S&S 1.725:1 rocker arms for .674" total lift.
  • S&S Premium High Performance Tappets
  • 1 year warranty


  • Wrinkle Black, Stone Gray, or Black Edition powder coat finish

Suggested Accessories