T143 Assembled Long Block Engine For 1999-'06 HD Big Twins (Except 2006 Dyna Models) - Wrinkle BlackS&S T143 Long Block Engine for 1999 '06 HD big twins (except Dyna models) as 143" displacement yet fits in a stock chassis. If Bigger is Better, the T143 is the Best The Biggest, baddest, bolt in for a Stock Frame. All joking about size aside, it does matter. The S&S T143 Long Block engine for is the largest S&S engine that will fit in a stock Harley Davidson chassis. Its big, 143 cubic inches. Nuff said. At double the HP of a stock motor, the power