Practice and Time Trials
In 1972, for the first time, USAC allows bolt-on wings to be affixed the cars. Previously, "wings" were required to be integral parts of the car's bodywork. Downforce levels increase by significant margins, and speeds climbed in practice. During a tire test in March, Bobby Unser reportedly drove a lap of 190.8 mph, the first driver ever to lap the Speedway unofficially at over 190 mph.
The official existing track record going into the month had been set by Peter Revson in 1971 at 179.354 mph. During the first week of practice, the stage was set for record speeds early on. During the first day the track was available, Sunday May 1, Jim Malloy became the first driver to break the 180 mph barrier in practice, at 181.415 mph. Later in the week, Malloy ran a practice lap of 188.048 mph, by far an unofficial track record. By the end of the first week of practice, 11 drivers had practiced over 180 mph.
During the second week of practice, Gary Bettenhausen turned a lap of 190.315 mph on Sunday May 7. He became the first driver ever of the month to break 190 mph. Two days later, Bettenhausen was over 191 mph. Not to be upstaged, on Wednesday May 10, Bobby Unser blistered the track at 194.721 mph.
By the eve of pole day, three drivers had cracked the 190 mph barrier in practice, and more than a dozen had practiced faster than the existing qualifying record.
Read more about this topic: 1972 Indianapolis 500
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