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In page Stock car racing:

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Then, in 1964 the new Chrysler 426 Hemi engine so dominated the series[citation needed] in a Plymouth Belvedere "Sport Fury", the homologation rules were changed so that 1,000 of any engine and car had to be sold to the public to qualify as a stock part, instead of just 500. This made the 426 Hemi unavailable for the 1965 season.