In development for roughly a year, a Wednesday NASCAR Cup Series rule book update includes the formal introduction and mandating of a new A-post flap for races at Daytona, Talladega and Atlanta ...
The prototype Gurney flap was developed on the 1971 Olsonite Eagle in advance of a USAC rule change that allowed detached wings for 1972. But for a twist of fate, the Gurney flap might well be known ...
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