My 216 sat outside with the head removed in the damp Oregon winters for 2 years although the oil pan plug was removed. After a couple days of soaking with PB Blaster it freed right up using a single jack and a block of 2X4. After cleaning up the cylinder walls a little the and putting the head on, adjusting valves etc.., it fired right up and runs great! I wouldnt even think of discarding a stovebolt motor because it is stuck...stuck means nothing to these old iron beasts.
