The same year, Brabham entered the famous Indianapolis 500 oval race for the first time in a modified version of the Formula One Cooper. It had a 2.7-litre Climax engine producing compared to the 4.4-litre, Offenhauser engines used by the front-engined roadsters driven by all the other entrants. Jack qualified a respectable 17th at 145.144 mp/h (pole winner Eddie Sachs qualified at 147.481 mp/h), and while the front-engined roadsters were much faster on the long front and back straights, the rear-engined Cooper's superior handling through the turns and the shorter north and south sections kept the reigning World Champion competitive. Brabham ran as high as third before finishing ninth, completing all 200 laps. Although most of the doubters in the American Indycar scene claimed that rear-engine cars were for drivers who like to be pushed around, as Brabham put it, it "triggered the rear-engined revolution at Indy" and within five years most of the cars that raced at Indianapolis would be rear-engined.