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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    HC4 Confirmed

    Chevrolet · Regular Production Option

    4.56 rear axle

    Years 1973–82 Models 1

    Documented applications

    This page aggregates every documented appearance of HC4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.