Originally Posted by
Dave, FormerDairyFarmer
Mr. Davis manufactures them for a shim. And cautions us to use one.
The head for my Sportster .20 wasn't machined to use a shim. There is no mention in the instructions for the .45 head about a shim either. Maybe he forgot to include a memo with this head. The fact that it needs the factory shim plus another shim is puzzling to me, but isn't a big deal.