NASCAR
In Autumn 1968, Richard Petty left the Plymouth NASCAR Racing Team for Ford's. Charlie Grey, director of the Ford stock car program felt that hiring Petty would send the message that "money rules none". However, the Superbird was designed specifically to lure Petty back to Plymouth for the 1970 season. Petty did reasonably well against strong Ford opposition on the NASCAR tracks that year, winning eight races and placing well in many more. Petty's Superbird appears as a key character in 2006 film Cars, with Petty as the voice of seven-time champion "The King" #43. The racing sponsor's branding in the film exactly matches the Superbird's paint as "Dinoco blue".
NASCAR's rules implemented for the 1971 season limited the "aero-cars" to an engine displacement of no greater than 305 cu in (5.00 l) or they had to carry much more weight compared to their competitors. While they were still legal to race, the power-to-weight consequences that would come with the smaller engine or the increased weight rendered the cars uncompetitive. This was the start of a trend of rules slowing down NASCAR, because the races were exceeding the technology of tires and safety over 200 mph (320 km/h). Ford in response also designed the 1970 Torino King Cobra with a batmobile-like nose, but it was abandoned.
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