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Failed manifold studs
Bob, can you post a photo of the failed end of your studs? I don't want to give you false hope, but it would be very unusual for a part of a stud to break off halfway into a threaded hole - let alone all three. All manifold studs, and all but one head stud, enter a water jacket; and what we have seen happen several times over the years, is that some studs didn't hold up very well and they literally became something like sacrificial anodes. The result was that as the end of the stud corroded away, it left behind a hard calcified deposit that can give the impression that part of a stud broke off and got left behind. When this happens, you can take a small screwdriver and use it as a "star" drill, turning it as you gently tap through the calcified deposit and then chase the threads with a 3/8" coarse tap. Don
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