Earnhardt to start Duel from back

Dale Earnhardt Jr will move to the back of the field for the start of his Daytona 500 Duel on Thursday after an engine failure in Wednesday's practice session. The Hendrick Chevrolet driver had secured sixth on the grid for his Duel, which will decide the starting order for Sunday's main race. "I'm sure there is some logical explanation as to what happened," Earnhardt said, "but we'll just put a new one in and start at the back of the qualifier and race up through there." Reigning NASCAR Sprint Cup champion Brad Keselowski suffered a less serious delay when a fuel pump problem on his Penske Ford sidelined him for some of first practice.

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