When i was in High School (around 91), my Dad and I converted a pair of 061 heads to screw in studs. I didnt have much money then. so we used stock “bottle neck” screw in studs. We did it all by hand, never used a drill or tap guide, drill press etc. never had a problem with the pattern or wear on those heads. Later converted to bbc studs. Sold these to my friend a few years ago, my brother ported them and he put nice valves in them. I had bought them from his grandfather from a wrecked executive (whole car). Anyway, thats my story lol. BTW, we used heli coils in them.
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