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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    NA6 Factory-verified

    Chevrolet · Regular Production Option

    High-altitude emissions equipment

    Years 1973–82 Models 4 Factory citations 7

    Also described as High-altitude emission controlHigh Altitude Emission EquipmentHigh altitude emission equipmentHigh-altitude emission system

    Documented applications

    Camaro
    • 1977–1979 Factory-verified
      GM Heritage factory kit — 1977 Chevrolet Camaro, p.5.
      GM Heritage factory kit — 1979 Chevrolet Camaro, p.51.
    Corvette (C3)
    • 1977 Factory-verified

      $22.00; 854 built; required above 4,000 ft

      GM Heritage factory kit — 1977 Chevrolet Corvette, p.48.
    • 1978 Factory-verified

      $33.00; 260 built

      GM Heritage factory kit — 1978 Chevrolet Corvette, p.22.
    • 1979 Factory-verified

      $35.00; 56 built

      GM Heritage factory kit — 1979 Chevrolet Corvette, p.7.
    Nova / Chevy II
    • 1977–1979 Factory-verified
      GM Heritage factory kit — 1977 Chevrolet Nova, p.58.
      GM Heritage factory kit — 1979 Chevrolet Nova, p.50.

    This page aggregates every documented appearance of NA6 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.