Since it’s founding in Spearfish, SD in 1982, New Life Builders has been dedicated to building and designing the best engines around exclusively for the Harley rider. The exclusive New Life Builders redesigned combustion chamber is a result of years of research and development. Our exclusive design has been used on Evo’s since the early 90’s and on twin cam’s since 2000. Our goal: a combustion chamber design that focuses all the explosive power at the top of the piston. The result: bikes that run at their most efficient and powerful in all applications. We will custom design your engine for your style of riding.