2X what dr sportster said. I recently tried for three weeks to remove an aluminum cast T'stat housing from a cyl. head that was held on by two nuts on 3 inch long 3/8 studs. The product of electrolysis corrosion builds up to such a degree between the steel and the aluminum that I believe that it is under extreme pressure instead of simple friction. I was successful at this same job on another car fifteen years ago. What I did was drill 3/32 holes into the aluminum right against the stud. I then injected acid in the hole with a syringe twice a day for a week. I also flushed residue out with water before each acid injection. I recommend three holes. I wasn't successful at the recent one, maybe because it had been getting worse for fifteen more years. This is way tougher than steel in steel. Good luck!
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