Think about most Indy heads feed 8 valves from a .040" orifice. The area of 8 .020" feeds far exceeds that. The pushrods I inherited were .090". Oil pressure never went over 45lbs. After a few tries I ended up pressing roll pins into the pushrods. There are approximately .058". larger feed than I would like, but oil pressure is manageable now. Runs 70psi@7000.
Doug