A milestone of sorts: accomplished the first spin-test of my DOHC design today and no parts escaped! Using belt/pulley reduction from a one HP motor, I ran the exhaust cam and valvetrain for a number of minutes. Only about 700 RPM (would be 1,400 engine RPM), but I'll do some parts-inspection before spinning it faster. Oiling of cams and followers looks good- I may decide to restrict the volume somewhat. Oil supply for now is a variable-speed drill driving an old oil pump, and uses the top-end scavenge cavity as a temporary wet-sump (1 1/2 qt.). Once I'm satisfied with the exhaust side, I'll need to do the intake side also, since the follower geometry differs (can't run intake and exhaust simultaneously until the synchronous belt drive is finished, or valves would collide).
Prior to this test, I finished incoming-inspection of the cams that Crane built (measured lift every one degree!). They agree 100% with the print and the lobe profiles are exactly what I specified- including the limit I placed on maximum negative acceleration [2x10^(-4) inches/cam degree-squared].