I start with a brass punch/hammer, Wack the head of the bolt a few times and spray penatrent on it , I use PB Blaster. If that don't do it, use heat from a torch ( be carefull things can go BOOM! ) "around" the bolt "not on the bolt".
That will let the aluminum expand around the bolt. Wack it with the brass punch/hammer again. Try to remove the bolt.
If that doe's not work and the head breaks off. find an oversized nut to put over the broken bolt. Weld the end of the bolt to the nut and try again!
If that's not an option then you can take it to a shop as Fred said, or Drill and tap until your fed up
Wipe up any spilled blood and sweat, Go have a bevarege of your choice and rethink why it is you want to do this
Good Luck!
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