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After the new Ford Taurus’ dominant performance in the Las Vegas 400, NASCAR announced rule changes Monday that should help Chevrolet and Pontiac drivers.

Starting at Sunday’s Primestar 500 in Atlanta, rear spoilers on both makes of Ford cars will be lowered one-quarter of an inch. The Taurus, which is phasing out the Thunderbird in the Winston Cup series, will have a 4.75-inch spoiler. Thunderbird spoilers will be lowered to 4.5 inches.

Lowering the spoiler height is supposed to slow cars in the turns and make the racing more competitive. The Chevrolet Monte Carlo will keep its 5-inch rear spoiler, and the Pontiac Grand Prix will stay at 5.375 inches.

Taurus drivers took the first seven spots and 13 of the top 14 in the inaugural Las Vegas 400 on Sunday. Chevy and Pontiac drivers complained bitterly that rule changes instituted before the first non-restrictor plate race of the year at Rockingham, N.C., gave the edge to the Fords.