DOVER, Del. (AP) - Kevin Harvick and Kyle Busch may have to play nice on the track now that they're on probation.
The drivers disagree about the incident that forced NASCAR to penalize them. And, they differ on NASCAR's interpretation of ``Boys, have at it.''
They do agree that they don't like each other.
Harvick says Busch spouts ``one lie after the other.'' Busch accused Harvick of being two-faced.
The verbal smackdown has turned Harvick-Busch into the feud of the week. Last weekend at Darlington, Harvick climbed from his car and threw a punch into Busch's window just as Busch pulled away, using his car to bump Harvick's car out of the way.
The drivers get an early chance to prove they'll be on their best behavior when they drive in Friday night's Truck Series race at Dover International Speedway.

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