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1972 ChevelleEmission Systems - Carburetor Heated Air (CHA)
Carburetor heated air (CHA) was first released in 1968 on Chevrolets to help reduce exhaust emissions without affecting engine performance, provide improved fuel economy, and eliminate carburetor icing.
Carburetor heated air uses a thermostatically controlled air cleaner (ThermAC) and was used on many 1968 and later engines that could meet emission standards without the air injection reactor system and could be coupled with the evaporation control system.
1971 LS5 (top photo) and 1972 L65 (bottom photo) show examples of carburetor heater air.
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