Thursday 13th May 1971
Mark Donohue recorded the first sub-50 second lap (49.73 seconds) and first 180 mph lap (180.977 mph) at the Indianapolis Motor Speedway.




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Mark Donohue recorded the first sub-50 second lap (49.73 seconds) and first 180 mph lap (180.977 mph) at the Indianapolis Motor Speedway.
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