From:Dave Hennessey
Subject:RE: RE: Hummer Date:Sat Sep 12 19:36:02 2015
Response to:20755

You are right about the numbers. More information about the various numbers found on a Harley can be found here:

Some of the info there is K/Sportster specific. I'm not sure what the format of the "belly numbers" on a Hummer-series bike looks like. I'm not sure if the Hummers even had frame date codes. Maybe someone with a bunch of engines and frames in their shop can answer this.