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

When GMC launched the Twin Six V12 in 1961, it wanted to prove that gas engines could stand up to diesel mills in the heavy-duty segment — and, in some ways, it did with its magnificent low-end ...

While core components, such as the milled aluminum and steel cradle frame, the enormous air-cooled 124 cubic inch S&S Cycle T124 V-twin engine, and the basic design, are shared—your Arch will be ...