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
1921 Indianapolis 500 the pole position as the only driver over the 100 mph mark. None of his four laps matched the track record (104.78 mph) set in 1919. This would be the first 500 that featured the familiar starting grid of rows of cars three-abreast. 1921 Indianapolis 500 The 9th International 500-Mile Sweepstakes Race was held at the Indianapolis Motor Speedway on Monday, May 30, 1921. Ralph DePalma dominated yet another early running of the 500, but again fails to win. He led 109 laps, and had a two-lap lead at the halfway point. A connecting rod broke, and he dropped out