Collection: S&S, Ultima, and RevTech Engines for Harley-Davidson Custom Motorcycles

There's a moment in every custom project when it's decided what soul will be placed into the frame. It's not the paint, not the wheels, and not even the sound of the exhaust that ultimately decides what kind of motorcycle will be yours – it's what works within the frame. The engine is what determines everything thereafter: the torque, the character, that feeling when you first twist the throttle on a freshly built Harley. S&S, Ultima, and RevTech are not by chance the most frequently mentioned names when someone is serious about Harley-Davidson custom building. These manufacturers have been proving for decades that an aftermarket power unit not only measures up to factory Harley-Davidson engines, but in many cases even surpasses them in performance, reliability, and character. Our selectionincludes complete S&S, Ultima, and RevTech engines in various displacements and performance levels, from classic Evolution and Twin Cam style designs to high-stroke, brutal torque performance versions. These engines are made precisely for those who are not satisfied with the ordinary – who build their dream Harley from the ground up. Whether it's the heart of a complete custom project, or the goal is a significant performance boost for an existing Harley-Davidson, here you will find the power unit that will truly be yours – not just one engine among many.