Best cocktail

So a week soaking in PB blaster but the engine still doesn't turn. I'm suspecting at this point that the pistons might be loose but something else in the bottom end might be preventing it from turning. I will need to get this back on the stand and turn it upside down. In the mean time I refilled the cylinders with ATF because it's going to be awhile until I get the engine on a stand and upside down.