1987 Indianapolis 500 Al Unser, Sr. held off Roberto Guerrero by 4.496 seconds, to win his record-tying fourth Indianapolis 500 victory. By leading the final 18 laps, Unser, Sr. tied the all-time record for most laps led in Indy 500 competition, and, at 47 years of age, also became the oldest winner of the 500. Mario Andretti's dominance of the month, and subsequent failure to achieve victory, was largely unprecedented in modern times. He led the practice speed chart on 11 of the 17 days (he participated in only 13 days), won the pole position, won the pit stop contest, had the fastest
1920 Indianapolis 500 refuel. Chevrolet held on to win. Seven months later, he was fatally injured in a crash at Beverly Hills. Chevrolet won the race without a single tire change, a remarkable feat at the time. Chevrolet was accompanied by riding mechanic John Bresnahan. Four-lap (10 mile) qualifying runs were introduced in 1920. Previously one-lap runs were used. Ralph De Palma won the pole position at 99.65 mph. None of his four laps matched the track record (104.78 mph) set the previous year. 1920 Indianapolis 500 The 8th International 500-Mile Sweepstakes Race was held at the Indianapolis Motor Speedway on Monday, May