Formula Atlantic

Formula Atlantic as a class evolved in the United Kingdom in 1971 from the US Formula B rules, with 1600cc production-based twin-cam engines (initially Cosworth Mk.XIII based on Lotus-Ford Twin Cam and then Cosworth BDD; however, other engines like Alfa Romeo were also eligible).

A single Yellow Pages championship ran in 1971-2, with a rival BP backed series appearing in 1973.

Only one series ran in 1975-6, in the final year taking the title Indylantic and adopting Indianapolis-style single-car qualifying.

A BRSCC-organized club racing series returned in 1979 with initial backing from Hitachi and continued to 1983, with diminishing grids and few new cars appearing.

During these years, the series attracted guest drivers from Europe, including Formula One, particularly at the Trois-Rivières street race in Quebec, Canada.

Guest drivers included James Hunt, Jean-Pierre Jarier, Riccardo Patrese, Patrick Depailler, Jacques Laffite, Didier Pironi, and Vittorio Brambilla.

In 2009, to shore up small race fields, the pro series introduced a "C2 class" for amateur-level cars, primarily the Swift 014.a, the dominant chassis in amateur competition at the time.

Since 2011, SCCA Club Racing has allowed the Swift 016.a and Mazda-Cosworth MZR, albeit with an inlet restrictor, to maintain parity with the older Toyota-powered cars.