 The first four-barrel carburetors, with two primary bores and two secondary bores, were the Carter WCFB and identical Rochester 4GC simultaneously introduced on the 1952 Cadillacs, Oldsmobile 98, Oldsmobile Super 88 and Buick Roadmaster.Oldsmobile referred the new carburetor as the “Quadri-Jet” (original spelling) while Buick called it the “Airpower”.The "spread-bore" four-barrel carburetor, first released by Rochester in the 1965 model year as the "Quadrajet" has a much greater "spread" between the sizes of the primary and secondary throttle bores.