The MoCo moved into OHV territory in 1936 with its Knucklehead engine. It still made the Flathead engine, but that engine was on a separate evolutionary path that wouldn't peter out until the 1970s.

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 ...