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A couple of weeks ago my engine heater plug came out causing the motor to majorly over heat by the time the warning lights came on ( coolant temp went to 299 and oil went to 350) . The engine shut down and I towed the car home. The motor still runs but smokes like a freight train, and sounds like hell. My question to all of you who have rebuilt a vette motor is how much can I bore out the cylinders without causing any problems. If it has to be rebuilt, it's going to be better than it was as a stock motor. Also any suggestions on where to buy parts online to rebuild this motor.