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I once worked as a mechanic for a private school. When I arrived there was a big OHV Lincoln V8 out of one bus sitting in the rain with one head off and many months of rust in the cylinders. It was stuck! None of the pistons was at TDC so I poured CRC556 (bought in bulk) into the cylinders and waited, a month maybe. Maybe longer. Eventually I was able to work the pistons loose, disassembled the engine, cleaned everything thoroughly, and reassembled it with a replacement head. Used the same rings, lapped the valves (expensive sodium filled). By the next fall the bus was back in service and ran fine for as long as I knew about it. Received an attaboy for getting the bus running without spending much money.