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
Indianapolis 500 firsts Program"<br> "2006 Indianapolis 500-Mile Race Program" Indianapolis 500 firsts †- During time trials, Bill Vukovich II turned his first lap at , to set the one-lap track record, and was the first driver to officially break the barrier. He, however, crashed on his second lap, and did not complete the four-lap qualifying run. Later in the afternoon, Joe Leonard qualified a four-lap average of to break the four-lap barrier. Later in the day, however, Bobby Unser qualified even faster, over , and became the first pole position winner to break and for his four-lap average. "Indianapolis 500 Chronicle", John Pope,