High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The 81st Indianapolis 500 was held at the Indianapolis Motor Speedway over three days, May 25– 27, 1997. It was originally scheduled Sunday, May 25, however, rain washed out all activities for the day. The race was started on Monday May 26, but rain halted the race after only 15 laps. On Tuesday May 27, the race resumed, and was run to completion. It was the second Indianapolis 500 held as part of the USAC-sanctioned Indy Racing League, and was part of the 1996-97 Pep Boys Indy Racing League season. It marked the introduction of a new production-based, normally aspirated engine formula as well as a new chassis design. A controversy during qualifying saw two additional cars added to the field after the close of time trials. It was only the second time since 1933 that more than the traditional 33 cars comprised the starting grid.

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