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.

Over the past 8 weeks, we have followed Harley-Davidson owners as they went head-to-head, across four powerplant-themed ...

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

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