[Johnny406]

Several years ago I made a very bad decision when I decided that I could carefully and accurately pull the pressed studs in a set of #47 heads and tap them myself (1/2-13) for screw in studs. I really thought I had them "close enough" so I could use Magnum style fulcrum rocker arms. Long story short, these heads sat for years until I put them on the 350 Pontiac I built for my son. Upon breaking in the engine, it didn't take overly long to drop a couple of cylinders after the poly locks vibrated/backed off from the geometry not being "close enough." I suspect I'm screwed but I used a conversion kit stud like these that do not have the 11/16 base so I used a pair of 7/16-20 lug nuts jam nut style to screw them in. Do you think there is much of chance that if I used the black ARP studs with the 11/16 pad, they would better center themselves?