The No. 28 Cummins Diesel Special was the first turbocharged engine to run at the Indianapolis 500, powered by a Model JBS-600 6.6L engine producing 430 hp at 4,500 rpm. While it won the pole position and broke the one- and four-lap all-time records, it was forced out of the race after 72 laps because of a clogged turbocharger.

Photo: Jack Roberts

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