Rob, Im afraid it sounds like youre gonna have to end up pulling the block but heres methods myself or some buddies have gotten to work. Similar to what you have already done, I have filled the cylinders with a witches brew of diesel plus brake fluid plus some auto tranny fluid etc., then removed the valve cover n rocker assembly so you dont bend any stuck pushrods n try n see if the valves will tap/shock/vibrate to close???? then one friend uses adapters and plumbs up hydraulic lines to the plug holes and applies some hydraulic pressure, but that sort of depends on where the pistons at in its stroke and the valves. If you can get a cheater to rock the crank/flywheel or try some pulling you may move things????? If you have to pull the block, fill the cylinders with that witches brew after a good soaking with PB Blaster or Kroil etc first and after a few days in the brew a good solid oak block and sledge ought to drive the pistons loose maybe??? Sorry, theres no easy or always works or perfect correct answer to this one, you have to try the fluids then the heat n shock n beat probably. let us know, Good Luck n God Bless John T
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