I think you said he installed bigger springs-----------well as other things have showed up, I'm wandering if the rockers will even clear those retainers underneath side-- I would suggest that yu get a vortec vavle and compare the tip length to the ones in your heads. vortec valve tips were longer for the alignment dealie with the rockers------


GM made a very good flowing head but sure intercourse themselves(and the rodding world) with a bottom line $$$$$ that throw away the years long development of the screw in stud/guide plate just to save GM a few bucks-----


I have done several sets of these with mods for the screw in studs, larger springs, and don't remember just where we ended up on push rod length( every thing done here is custom so no off the shelf numbers)