Formula Atlantic was formed in the late 1960s, in the US, under the guise Formula B. The Sports Car Club of America created Formula B to fit between Formula C, for cars with a maximum engine size up to 1100cc, and Formula A, for stock block race cars with a maximum engine size of 5000cc, as part of its new SCCA Grand Prix Championship. Initially, all three classes competed in the same race, but as Formula A rapidly grew in popularity, Formula B became a stand-alone class.