Hi Jerry-
This is a new topic for me and I am curious. Where does the drilling for an oil passage take place? Is it just a counterdrill feature in the lifter bore? I feel stupid asking, but I can't picture anywhere that a 19/32" diameter would occur. Thanks for helping me learn! (I actually have an extra block sitting around, so I want to go and check)


55 GMC 3100 2nd Series
71 GMC 1500 Super Custom