Rivalries are what make racing riveting. Mopar vs. Ford, North Carolina vs. South Carolina, Puralator vs. STP … and today, Richard Petty versus David Perason. Why did they wind up in head to head battles almost every week? How did their rivalry push NASCAR to the limits and save the sport from suffering the same fate as the auto industry during the 70s? All that and more on today’s Past Gas!

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