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Hello mepstein,
I agree.
If you pull an engine down it makes good sense to replace all the Dilavar studs. Disturbing them twice (undo and redo) can obviously send them over the edge - and this seems apparent in your example with 2 or 3 pinging off just after the rebuild.
However, if the studs have lasted 50 years, and are left undisturbed, they are unlikely to ping for quite a while. If anything, replacing broken studs will lower the pressure on the remaining unbroken ones.
But in the end it is a personal choice. To avoid pulling down an otherwise sound engine would be attractive to many people, and once you are set up to replace a broken stud with the engine still in the car, there is little time and cost in doing that as required. If you have to end up removing the engine in order to twist out a stud, then of course that might alter the equation.
Cheers, Brian
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