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If you aren't really familiar with using an open flame under an engine - I suggest just drilling. The flame method may work but the collateral damage potential if you are not experienced could be sad.
Be very careful drilling because the bolt is hard and the surrounding metal very soft.If the drill bit goes off alignment and starts removing aluminum ......
Have you saturated the offending bolt shank with Kroil or PB Blaster?
In the past I have suggested replacing these bolts with s/s studs+Blue Loctite. The correct grade of Loctite on the bolts helps prevent the corrosion but does nothing to stop cross-threading. There are appropriate size stud kits on EBAY.
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