Originally Posted by SledDog

And nothing sounds as good as 2 shovels riding side-by-side... If you''ve ever done it, I'm sure you notice the shovelhead thrum. For those that haven't, it's the sound of 2 shovelheads running at just about the same engine speed. The engine are just abut in sync, but just enough off to create what would best be called an echo between the 2 different motor sounds.

You can only hear it when 2 shovels are running side-by-side or in a short stagger. EVOs and Twin Cams don't do it. Just the shovels.

It's the one thing that AMF did right. They gave the shovels a soul. There's nothing else like it in the world.

That's why I still have my first Harley.