A note about K-model frames.   The easiest way to tell if you have a K or KH (52-56) and not a Sportster frame at a glance is to look at the top motor mount bracket, also called the "engine steady," located in the middle of the frame top tube.  The Sportster Bracket (from 57 on) is made from stamped steel and looks like an open-sided box.  The K and KH-model bracket (from 52-56) is a cast piece and is open to either side.

Of course, you can put an Ironhead motor in a K-model frame and vice versa, but there are differences.

Please see my Sportster frame guide for more information about frames and dates.

For more detailed information about K-model and Sportster frames and how to tell the difference, Google the title below and then scroll to the posting by the famous "French Owl."

"Is this a K-Model frame?"