Just in case someone has put a steel screw into aluminum with Loctite(idiotic,but it’s been done)then you’ll need heat to break the Loctite loose.
I've probably had a couple dozen people suggest that I use heat anyway, just to expand the aluminum block. I'm going to try that, along with one of the better penetrating oils. If there's any Loctite in there, that ought to break it loose,
Thanks for the great info.