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F yeah, take a 12" 2X2 piece and start hammering those pistons out the top. They will break free and leave a nasty rust scar on the wall but it will most likely wipe out with a dingle ball hone. 1/2 ATF and kerosene is cheap, as said the ATF will find any passage to leak. Biggs(?) penetrating oil said they needed a special spray nozzle as their oil would leak past a regular paint type aerosol nozzle. We had a 302 Ford Motor locked up good. We filled the cylinders with ATF/Kerosene and put a 5 foot piece of 1" galvanized on the breaker bar and hung 2 25 lb weights on the end. 2 days later the weights were on the ground and the pistons were broken free enough to work the crank 360 degrees. We pulled the pistons, freed up and cleaned the rings and put that thing back together. Ran with no smoke! High school auto shop motor rescue.