And so it came to pass, in the land of Milwaukee, that the Flathead begat the Knucklehead, the Knucklehead begat the Panhead, the Panhead begat the Shovelhead, which in turn begat the Evo. And in time, the Evo begat twins and named them Twin Cam 88 and Twin Cam 88B - because it would be cheaper for the name tags in the back of their school uniforms. There was an awful lot of begetting going on, but that really is only part of the story ...