 From 1970 the event's distance went from three hours to 250 miles, with Colin Bond driving a Holden LJ Torana GTR XU-1 to victory in 1971 and John Goss winning the last Series Production 500 in 1972 in a Ford XY Falcon GTHO Phase III.The race was contested by the newly introduced Group C Touring Car category from 1973, while from 1976 the event became known as the Sandown 400, held over 400 kilometres, despite only being scheduled for 338 kilometres in 1980 and 1982.During the Group C era, the event was dominated by Peter Brock who won nine of the twelve races, six with the Holden Dealer Team.