RE: O.S. .46 AX Shims
Bench racing is what we do best in Minnesota when its too cold to fly.
I only had 10 shims of each type and thickness (40 total) cut. We use this engine to race locally, and have found that the stock head spacing is a little high. It comes with a .008 shim under the head, and dropping it to .004 or .005 has shown some improvement with the stock muffler. Not sure with the Jett pipe.
I thought I would get extra to help out the locals, not really interested in shipping any. Maybe A.J. can pipe in with his source, and you can order them from there.
I'm not sure I would remove the locator pin, it is helpfull in keeping the sleeve in place when installing the head. It would be simple to dremel it off if you were carefull. However, that mod would probably take away the "stock" classification of the engine for our racing class.