Went to change the water pump on the 4 dr Valiant and the upper, passenger side long bolt is stuck!!! AND I mean stuck. It will not turn with a hand ratchet, not with a air ratchet, not with a 1/2 impact or breaker bar. The radiator has been empty for a while and the inside of the hoses and thermostat housing are really rusty. Any good tips for getting some oil or rust breaker to the threads? I'm afraid I will break it off if I put on a cheater pipe and I really don't want to pull the motor. Let's hear those great secrets.