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Does a 1985 Chevrolet truck need catalytic converter?

No, a 1985 Chevrolet truck did not *originally* come equipped with a catalytic converter as standard equipment on all models. Catalytic converters became more common in the mid-1970s and early 1980s, but their widespread use on all vehicles wasn't mandated until later. While some 1985 models *might* have had them added as a dealer option or aftermarket addition, it's not a factory standard feature on all trim levels and engine types.