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B-Bob -- You have a small tiger by the tail here. Perhaps the greater question is which has more value, cylinder block or a set of studs? Whether or not to apply heat is one issue such as -- how much is too much? Lots of heat will likely weaken a stud. And then whether a so-called stud remover is used, or you choose the double-nut method, substantial torque is quite often needed to remove one or more of them. Excessive torque (How much is that?) will also weaken a stud. All this being observed, my take on this -- is to pretreat with Kroil or PB Blaster for several days, and then attempt to back them out. If they come along with no greater torque than would routinely be applied during installation, the stud is reusable. If exceesive torque is needed and/or if heat is needed -- the stud should become a trophy (replace it!). Emphasis during stud removal must be placed on protecting the cylinder block. And as for having the machine shop remove them, you almost have to assume they will use heat to avoid damaging the cylinder block -- and in this case, buy a whole set of new studs! You can call this being too cautious -- I call it "been there, had it happen to me". During build-up, after a 2nd retorque, one stud gave way -- sounded like a gunshot -- not a desired outcome. (PatB)
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