Thompson made his debut in 1950 and won two of the seven races he competed in 1953 in the No. 46
Buckshot Morris Oldsmobile (including the
1953 Wilkes 160). Thompson made 15 starts in 1955 and made a serious attack on the Championship the next year, competing in 42 races in
Carl Kiekhaefer's factory-backed
Chryslers and
Dodges, winning eight times and finishing third in points. 1957 saw a switch to Hugh Babb's and his own
Chevrolet's and another third-place result, capturing only two victories that year. Speedy drove his own Chevy for the entire 1958 season, and another third place was the reward for his four victories in 38 starts. In 1957, Thompson set the 500-mile speed record for stock cars with an average speed of 100.1 mph. This record was quickly broken by other drivers and by Speedy himself. In 1959, he became a charter member of the "Pure Record Club" along with
Fireball Roberts,
Elmo Langley, and
Richard Petty who set the fastest qualifying speed in each make of automobile competing. Another third place in points came in 1959 from 29 starts in a variety of different cars, this time with no wins. 1959 would be Thompson's last full-time effort in the series (participating in 24 different racing events including the
1959 Hickory 250) and he left Grand National after the 1962 season, choosing to race at late models at local North Carolina short tracks. He returned to NASCAR's top series, then called the Winston Cup, in 1971 for the
World 600 where he finished 16th. ==Death==