I've seen studs that have a 7/16" thread for the head and 3/8" sticking up for the rocker. Seems to me Comp Cams had them.
If you are running out of thread on the bug block studs before the rocker touches the valve, then you might try PolyLocks instead of the stock nut. They have an unthreaded shoulder so can adjust the fulcrum ball lower on a given stud thread length.
Your odds of opening up the fulcrum holes are pretty slim, as they are very hard metal.
Good luck, and let us know what you end up using.
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David
newbie #4153
