In fact, the manufacturer had an entire line of head-themed engines, including the Knucklehead, Panhead, and Shovelhead, with some featuring in the rarest Harley-Davidson motorcycles ever built.

When you think about Harley-Davidson, the last thing that comes ... Knucklehead, and Shovelhead, engines that would set the stage for most modern V-Twins. While the two-cylinder motors fused ...

Harley-Davidson This engine, later increased to 61 cubic inches and then 74 ... including the Knucklehead, Panhead, Shovelhead, Evolution, Twin Cam 88 and the Milwaukee-Eight. The most recent ...

Harley-Davidson. That's as American as ... Knucklehead, and Shovelhead down to the Evolution and Revolution engines. However, although all these engines are special in their own right, a few ...