The sixth caution of the race flew on lap 274 when Kurt Busch, who had been dealing with dropped cylinders, blew an engine on the backstretch. Busch, who finished sixth in the Indianapolis 500, would finish a disappointing 40th. "It acted like it swallowed three cylinders all at once," he said. "It's kind of a shame. It symbolizes how tough it has been for (my NASCAR) team. I thought it was great racing in traffic. The feel of the stock car right after driving the IndyCar is a feeling I'll never forget." Kurt ended completing 907 of the 1,100 combined miles that make up the Indianapolis 500 and the Coca-Cola 600. Kenseth and Jeff Gordon swapped the lead on pit road, with the former pitted behind the start/finish line, but Jimmie Johnson found himself back in the lead.