The Autosport 3 Hours has been run twenty times since 1956. All but the first at Oulton Park have been held at Snetterton.

Production Sports Car Racing, 1956

Production Car Racing, 1957

Autosport, 1957

The Autosport Championship, 1960

The Snetterton Motor Racing Club, 1962

The "Autosport" Championship, 1963

The "Autosport" Championship, 1964

The History of Snetterton, 2001

Endurance Racing at Snetterton, 2001

The Autosport Three-Hour Race & The Autosport 3 Hour Race of 1964, 2014

The Autosport Three-Hour Race, 2015

Autosport 3 Hours, 2023
In 1965 the Autosport Championship culminated with two 65-lap races at Snetterton rather than the traditional three hour race.