MICHEAL, griggs idea is very good if you have enough thread depth. but if that doesnt work just use some rtv silicone sealer. i see that all the time at the dealership i work at. alot of the new aluminumn engines and heads have bolts on them that go into water ports and jackets and with what your talking about a blob of sealer in the hole and then another blob on the bolt before you run it in should solve your problem. be sure to avoid the jb weld unless your are ONLY going to use the stud as mr beaver had mentioned otherwise you with never get a regular hex bolt back out if you need too.
~army truck