Thanks JB! I finally found it in Larry Shepard's MP book. He lists the shaft o.d. at 0.873 so now I can see how badly my rocker arm bushings are worn once I pull them apart. The fsm list clearance at 0.0007 to 0.0012 which seems tight to me, but maybe like rod or main bearings a bit more is ok for a performance application. Any input is appreciated! Dave