qualifying races consisted of Convertible division cars and the second of Grand National cars. Shorty Rollins won the 100-mile Convertible race to become the track's first winner. When the green flag was thrown on the first Daytona 500, 59 cars raced to the starting line; the event was held without a caution period during the entire race. In 1960 (incidentally, the first ever national telecast of a NASCAR race), the last chance race was eliminated; from 1960 through 1967 the qualifying events were in length. When the season opened in 1968, the qualifying races were increased to , which meant the drivers would have to make at least one pit-stop to refuel (though the races were not held because of weather in 1968). Prior to 1971, the qualifying races yielded points to the drivers' championship. The reduction in speed for the 1971 qualification was a result of NASCAR's effort to limit the increasing speeds achieved through the late 1960s and early 1970s. Engine size and technology, along with increased aerodynamic styling changes, brought speeds to over at some of the larger superspeedways. In an effort to reduce the escalating costs of developing faster racing equipment, increased horsepower, and the lack of parity in competition, NASCAR implemented several restrictions for the 1971 season, attempting to reduce speed by two methods. It experimented with restrictor plates for the first time at Michigan in August 1970. At the beginning of the 1971 season, NASCAR limited an engine's cubic inch displacement. The reductions had the effect of reducing costs for teams, but also limiting the horsepower and top speeds of NASCAR teams. At the time, NASCAR founder Bill France Sr. stated: Corporate sponsors purchased naming rights to qualifying races; between 1982 and 1984, Uno cards was the title sponsor for the "Uno Twin 125's" qualifying events. In 1985 they became known as "7-Eleven Twin 125's"; no sponsors funded the 1988 and 1989 qualifying events and the races were called "Daytona Twin Qualifiers". Gatorade became the sponsor of the dual qualifying events in 1991. In 2005, the event was increased , and became known as the "Gatorade Duels" until 2015. Starting in 2016 CanAm took over sponsorship of the races, where it stands today. Since the restrictor plate era began in 1988 until 2014, qualifying was the better single lap of two; drivers are permitted one warm-up lap followed by two consecutive timed laps. Since