1910–1950[edit]
Further information: Grand Prix motor racing
The 1930s saw the transformation from high-priced road cars into pure racers, with Alfa Romeo, Auto Union, Bugatti, Delage, Delahaye, and Mercedes-Benz constructing streamlined vehicles with engines producing up to 450 kW (603 hp), aided by multiple-stage supercharging. From 1928 to 1930 and again in 1934–1936, the maximum weight permitted was 750 kg (1,653 lb), a rule diametrically opposed to current racing regulations. Extensive use of aluminum alloys was required to achieve light weight, and in the case of the Mercedes, the paint was removed to satisfy the weight limitation, producing the famous Silver Arrows. NASCAR was founded by Bill France, Sr. on February 21, 1948, with the help of several other drivers of the time. The first NASCAR "Strictly Stock" race ever was held on June 19, 1949, at Daytona Beach, Florida. The Strictly Stock division was put on hold as American automobile manufacturers were unable to produce family sedans quickly enough to keep up with post-World War II demand.[18]
1950–present[edit]
After the Second World War, sports car racing emerged as a distinct form of racing with its own classic races, and, from 1953, its own FIA-sanctioned World Championship.NASCAR's Strictly Stock Division was renamed the "Grand National" division beginning in the 1950 season. Over a period of more than a decade, modifications for both safety and performance were allowed, and by the mid-1960s, the vehicles were purpose-built race cars with a stock-appearing body.
From 1962, sports cars temporarily took a back seat to GT cars, with the FIA replacing the World Championship for Sports Cars with the International Championship for GT Manufacturers.[19] Through the 1960s, as superspeedways were built and old dirt tracks were paved, the number of dirt races was reduced.[20]