High Quality Content by WIKIPEDIA articles! The 1972 Indianapolis 500 was held at Indianapolis Motor Speedway on Saturday, May 27, 1972. Gary Bettenhausen leads 138 laps until his engine blows on lap 176. Jerry Grant gets the lead but pits for new tires on lap 188 in team mate Bobby Unser’s pit. Bettenhausen’s Penske team mate Mark Donohue wins after leading 13 laps. After a post-race re- examination, scoring is stopped on Grant because of the pit lane violation. Bolt-on wings were allowed for the first time, and during qualifying Bobby Unser runs over 196 mph (315 km/h), breaking the one- year-old track record by over 17 mph (27 km/h). During the race, Wally Dallenbach Sr.'s car catches fire on each of his three refueling stops.

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