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The 1981 Hang Ten 400 was an endurance race for Group C Touring Cars. The event, which was Round 3 of the 1981 Australian Endurance Championship, was staged on 13 September over 119 laps of the 3.1 km Sandown International Motor Racing Circuit in Victoria, Australia. It was the 16th race in the history of what is now known as the Sandown 500. Colin Bond and Steve Masterton were the winners of Class B in a Ford Capri V6, while Sydney's Peter Williamson won Class C with a Toyota Celica. Class D was won by Craig Bradtke and Rod Stevens driving a Mitsubishi Lancer.