Re: how to loosen stuck motor
After trying all the penetrants you can devise and if it is still really stuck, I'd take it out of the car and start taking it apart. Once the rods are detached from the crank, remove the crank and with the head off, start in on it with a FBH. Breaking a piston or even all of them won't matter. There is no point being gentle with stuff you will be throwing away anyway.
Once you can see the crank journals, cam shaft etc, you might even decide that there is so little in there worth saving that you pass on it.
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