sentences:  That year, NASCAR founder and president Bill France Sr. became its promoter and helped attract NASCAR drivers like Curtis Turner, Joe Weatherly, and Lee Petty to the track.France left his position at the speedway in 1956.Motor City Speedway promoter Andy Barto served as Flat Rock's promoter until he stepped down in March 1956 and was replaced by Hayes, who was the track president, to commit his work to Motor City; Barto returned to Flat Rock as its general manager in 1959.