The first year of the series provided a mix between imported cars and USA big bangers. The first race, 35 under two liter cars took the start, with works entries from Alfa Romeo, Ford and BMC while the big cars (9 of them at Sebring) had a very limited factory support of Chrysler and later Ford. Was the first year a succes? Yes. For 1967, works entries of Ford, Mercury and Chevrolet were announced.