I have an early camshaft regrind and the casting numbers were ground off. The end of the crankshaft is stamped "AmeriCam" in script followed by 1. Also on the end is 231 & 2586. The lobe shape is similar to the OT-20. Any ideas out there? Anyone familiar with "AmeriCam"? Ed Corson (CORSA member) IECC - Riverside, CA