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Two JGR cars change engines

Updated: March 3, 2013, 5:40 PM ET
By Terry Blount | ESPN.com

AVONDALE, Ariz. -- The Joe Gibbs Racing cars of Denny Hamlin and Kyle Busch had to change engines and start Sunday's Sprint Cup race at the back of the field, but Toyota officials said the motor problems were unrelated.

"Both were valve springs, but one was a mechanical failure and one was human error," said David Wilson, vice president of Toyota Racing Development. "There is no cause for concern heading into the race [Sunday] afternoon."

Hamlin's No. 11 Toyota team changed the motor ...

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