Quote:
Originally Posted by brewerbry
I think I will heat the whole thing with the propane torch and see if it loosens at all. Let's all be realistic with the torch - it is not a precise instrument and you end up heating both the both and the surrounding metal, there is no way to only heat one or the other. Regardless, I will apply heat for a couple of minutes and hopefully it breaks loose this time.
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No heat isn't precise but the ability to transfer heat is. Heating the surrounding metal of the head allow the head to expand and grow the hole. The transfer the the bolt is very slow due to the corrosion and the poor contact between the alum thread and the steel thread. The transfer takes time and give you a short time where the hole is bigger than normal allowing for loosening to happen. Even in a steel head this works well.
Be patient and good luck.