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The USAC National Championship used to count points from dirt and pavement races. To win the title, owners and drivers had to field two distinctly different cars (front engine "dirt champ" cars and rear engine pavement formula cars). In 1971, dirt races were separated from pavement and dirt was classified as "Silver Crown" and the pavement was classified as "Gold Crown". In 1979, Championship Auto Racing Teams (CART) was formed by USAC Gold Crown car owners who were unhappy with USAC. By 1981, all Indianapolis-style pavement racing was sanctioned by CART except for the Indianapolis 500.
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