The 1975 Old Dominion 500 was a Winston Cup Series (now Nextel Cup) event held at Martinsville Speedway on September 18, 1975. Dave Marcis led just 52 of the 500 laps, but Marcis was able to hold off Benny Parsons by three seconds for the victory. It was Marcis's first career win. Richard Petty had a rear end gear failure, finished 22nd, but still held a gigantic 784-point margin on Marcis in the points. Stats