General Motors once made floor tile at the AC Spark Plug plant in Flint, Michigan. The decorative ceramic tiles were made by a subsidiary called the Flint Faience Tile Company between 1921 and 1933.The Flint Faience Tile Company was created to make use of the kilns used for firing porcelain AC spark plugs during non-peak… Read More Flint Faience Tile Co. – Rostie Publishing