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Yes, it makes sense now. You have damaged studs, causing the nuts to lock on them, before tightening down, causing the stud to turn in past where it should be and finally the damaged part giving way and threads stripping. Not a pretty picture as it will cost as much as head studs would. IN othe words the cam towers have to come off and be seperated from the heads. Good news is the cylinders. pistons and case halves stay intact.
What I suspect is that the studs were damaged somehow. The damage caused the nuts to sieze up on the stud causing the stud to turn. Removing the studs, re threading them and reinserting them, with red loctite will fix this problem. Studs that were stripped must be replaced. At least I suspect it will based on my assumptions on what is wrong.
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