This year is the 40th anniversary of the stock-block five-litre single-seater Formula 5000 category and at least 16 of them will be on the grid this weekend at Pukekohe.
The Historic Racing Club/MSC Formula 5000 Tasman Cup Revival Series has attracted British husband and wife team Frank and Judy Lyons, who have bought two cars, a Lola T400 for Frank and a rare Eagle FA74 for Judy, to race.
The pair are part of a four-strong contingent of overseas drivers joining the series for the next two rounds, first at Pukekohe and then at Taupo.
The others are Australians Bob Harborow, in a Lola T192, and Aaron Lewis with his Matich A53.
In its heyday - between 1970 and 1977 - Formula 5000 (or Formula A as it was called in the United States) was the premier national single-seater formula in America, Australia, New Zealand and South Africa, as well as one of the main domestic single-seater categories in Britain. Eventually, the class was superseded by the smaller, lighter and supposedly cheaper Formula Atlantic (Pacific in NZ).