Robert Slovick has owned the 1934 Ford coupe since 1997.
He had invested $75,000 to restore it and said it is now worth $250,000.
"There's a reward. Please, you've got to bring this car back," Slovick said. "It means so much. You have no idea what you've done."
Anyone with information is asked to call the /*Garden Grove Police Department*/ at (714) 741-5704.