On Buicks str 8's I used to make my own. Put a bolt in the adj. screw hole- machined it flat top and bottom-made a ficture with a guide hole in it to redrill all the adj. screw holes closer to the rocker shaft hole. Did have pushrod clearance problem-cured with the same die grinder I ported the head with. Used stock Buick pushrads (they are tubular) never bent a one at 6000 RPM. 1 OL REDNECK
