C38a

Whenever a sport involves the equipment, the governing body for that sport tries to neutralize the machinery, therefore leaving the contest up to the contestants.
NASCAR has been known to change the rules throughout the season as they see fit.
After a winter of testing, just before the Daytona 500, NASCAR gave the Ford teams a rules break. The Dodge body and Ford body are about the same so it made no sense that one would get the rules break while the other didn't.
Ford and Chevy both win plenty of races, so to me, Pontiac was due for rules changes.
5 of the top 10 were Fords after the event.
2 Chevrolets and 2 Dodges got into the top 10. A Dodge did win the event. Again, Ford and Dodge bodies are very similar.
The highest finishing Pontiac was 10th. The next highest was 26th.
To me rules breaks are like changing the size of the clubs to golfers.