The winner is granted the honour of racing with a gold roof and wing until the next World Final.
The host tracks, all of which are based in Britain, are chosen by the designated promoter.
Drivers who fail to progress from the World Semi-Finals may race again in a Consolation Semi-Final to choose two more entrants, and the reigning World Champion is entitled to start at the rear of the grid if they have not already qualified.
The most successful driver in World Final races is Rob Speak, who has won eight.
Other notable multiple winners include Bill Batten (four), Dave Brown (three) and Gordon Moodie (three).