RPOARCHIVE
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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    ZQ4 Single-source

    Chevrolet · Regular Production Option

    350ci 270hp base Engine (standard, RPO-tracked)

    Years 1971 Models 1

    Documented applications

    Corvette (C3)
    • 1971 Single-source

      Std. (no cost); 14,547 built (only CAC lists it as an RPO line; not found as a code in the factory kit)

    This page aggregates every documented appearance of ZQ4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.