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Other than the camshaft, the only non-original component on our '72 Trans Am is this rare '71 455 H.O. Quadrajet. For increased airflow, these unique units lack the traditional booster rings found in other Q-jets. Like many carburetors of this era, its idle circuit was already lean to combat emissions, but once we added a slightly larger camshaft, the mixture screws had little effect. So it was sent to Q-jet guru Cliff Ruggles for recalibration.