How do you unlock a 350 motor on a 1970 Chevy Monte Carlo No motor oil locked it up.?

Answer 1

Need More InformationThat will depend on what locked it up. Could need a teardown. AnswerIt could have locked up because something broke internally -- did you run it without oil?

If it is locked up after sitting without oil then it is just corrosion. Remove the spark plugs, pour Mystery Oil down all of the spark plug holes - give it an hour to soak in / work past the rings. Fill the engine with oil - if the engine will not turn by the starter, disconnect the battery and turn the engine over with a socket on the crankshaft pulley bolt (Mystery oil will shoot out of each cylinder on the up stroke) Keep turning the crank this way until the engine turns easy enough to turn with the starter. Once it is turning freely again, replace the spark plugs and reconnect the battery. Start the car (it will smokebadly for a couple of minutes until it has burned the mystery oil out of the cylinders). On the next oil change, replace one half quart of oil with a can of "engine restorer". It comes in a silver can and has a long-term reputation for filling in scratches unlike all of these new fly-by-night additives.