Original vintage magazine ad, AC SPARK PLUGS. Division of GENERAL MOTORS CORPORATION, of Flint, MI. A Line on Economy. Clean Spark Plugs Give you a Smoother, Snappier Engine. Old 1940 car parts advertisement.
Original old car parts magazine vintage ad for AC SPARK PLUG COMPANY of Flint, MI. Dirty or Worn Plugs Waste One Gallon of Gasoline in 10. Have Your Plugs Cleaned by the New AC Method. Thi..