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Sure beats taking the head off. Keith_J is right, antisieze just about anything that threads into the block.The electrolysis that starts because of metals being different will cause corrosion eventually, no mater how nice and dry anything is.

3 things, try one of those vibrating engravers, I have been able to gring a little pad off center and the high frequency vibs will sometimes back even a rusted bolt out. then if not that a reverse twist drill bit,,,,,,and last of all an easy out,, ok number 4 would also be to put dry ice on...