when i bought my 41 ford, the flatty was stuck. i dumped a mix of coca cola and marvel mistery oil down the plug holes. a week later it was free and running. i used a breaker bar on the crank pulley and slowly added pressure. when it did break free, i was no where near my full weight pulling, 220 at the time. the car was last turned over in the late 60s prior. the hood was never left up and the air cleaner was always on.

bob