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.

Harley-Davidson's Twin Cam 103 and Milwaukee Eight 107 engines have their similarities, but there are some important ...

Nowadays, the V-twin engine is ubiquitous in the motorcycle world. Powering everything from speedy sport bikes to massive ...

Harley-Davidson isn't the oldest American marque – that distinction goes to Hendee/Indian – but it's the only one that has been in continual operation since its inception in 1903 up through ...