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If you are talking about where the exhaust flange connects to the head then those are not bolts but studs which are attached to the head first so the aluminum threads in the head will not get worn and stripped out from being spun while having the load of tightening the exhaust flange applied. You need a new set of exhaust studs, washers and nuts to repair this. If you are fortunate they were not in tight enough and spun out when the extremely cold engine was first started however they may have also been installed too tight and when the engine heated up poped out due to thermal expansion stripping the threads from the head. You may need to drill and tap them out to the next larger size if that was the case.
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