It was the third year contested with the supercharged 91 cu. in. (1.5 L) displacement engine formula. A total of seven supercharged front-wheel drive cars were entered, and they swept the front row during time trials. Leon Duray in a Miller took the pole position with an average speed of , a new track record. Duray dominated much of the first half of the race, setting a blistering pace. He dropped out in the second half, however, due to an overheating engine.