Since the return of Dodge to the Winston Cup series last year, the Pontiac Grand Prix has declined in competition, even though it won two of the last three drivers championships.
Chevrolet has won 23 of the last 31 Winston Cup manufacturers' championships. It already has clinched this year's title.
The only Pontiac winner this season was Ricky Craven, who edged Kurt Busch by .002 seconds at Darlington in March.
Despite the power of Chevrolet, which has 17 victories this year, Ford Taurus driver Matt Kenseth is on course to win the series title.