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Fount this by chance :

An Illustrated History Of Automotive Aerodynamics – Part 3: Finale | The Truth About Cars

We’re not going to pursue the evolution of racing aerodynamics further in this limited survey, but the Chaparrals’ influence would also quickly spill over into passenger cars. GM hired an aerodynamicist back in 1953 to assist with wind tunnel tests on its turbine concept cars, although he was grossly underutilized for years. But GM’s technical assistance to the Chaparral team was a well-known fact. How much of that was aerodynamics is not clear, but the first mass production car to sport a chin spoiler like the 2B above was the 1966 Corvair. It was added in the second year of the Corvair’s 1965 re-style to reduce drag and improve down force and cross-wind stability.

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