The 1975 Mason-Dixon 500 was a Winston Cup (now Nextel Cup) event held at Dover on May 18, 1975. David Pearson led 353 of the 500 laps in route to a dominating seven-lap victory on Cecil Gordon, who earned his best career finish. Points leader Richard Petty finished 3rd and held a 287-point lead on Dave Marcis (20th). Stats