If you do attempt the heat, clean the head of the bolt free of paint, etc. This will localize the heat to the bolt for a short period of time. Hopefully making the corrosion a little more pliable.
It's really hard to judge just how much heat is needed. I've seen it take a little to enough to blister the surrounding paint.
Attempting to tighten the bolt sometimes helps.
An impact usually dictates having the need for a feel to judge when it's too much.
Problematically, wringing the head off might not help if the corrosion has it seized on the shaft of the bolt. Consider this as a last resort.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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