Harley-Davidson has made a few engines that can keep going forever with the right amount of TLC. Here are 10 of them ...
Harley-Davidson isn't the oldest American marque – that distinction goes to Hendee/Indian – but it's the only one that has ...
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.