Daytona International Speedway (Daytona Beach, Fla.) — Kevin Harvick remembers Greg Biffle once drove so hard, he broke his leg. They were racing against each other at Mesa Marin Raceway, years before either was competing on Sundays on stock car’s biggest stage. "I was running first, and he was running second," Harvick said as he told me the story. "And he was pushing so hard that he bounced the car off the outside wall so hard that night and broke his leg, trying to get everything out of it. "And the Biffle legacy was just that. He was always pushing the car to the max. He had just unbelievab...

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