I was curious what others have used to unstick an engine? I have used Kroil on various frozen and rusted things, but never have used it for an engine. For years, I've heard others mention the 50/50 mixture of ATF and acetone, but never tried it myself. I know of one guy who soaked the cylinders on a Farmall 560 with just ATF, but it didn't free it up.
Some have just chained two tractors up (one in the front and one behind) to the stuck tractor and pulled it back and forth in gear to pop the engine free.
A JD model 70 is what I'm trying to free up the engine on.
On some engines I've seen an impact wrench used to turn the crank.