The 1966 Firecracker 400 was a Grand National (now Nextel Cup) event held at Daytona International Speedway on July 4, 1966. Sam McQuagg led 126 of the 160 laps in route to his only career victory, holding off Darel Dieringer by sixty-six seconds. Eventual season champ David Pearson finished 15th. Stats
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