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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

    Emission system, high altitude

    Years 1973–89, 1993–96 Models 19 Factory citations 61
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    Also described as High-altitude emission controlHigh Altitude Emission EquipmentHigh-altitude emissions equipmentHigh altitude emission equipmentHigh-altitude emission systemHigh-altitude emissionsEmissions, high altitude

    Also documented for GMC

    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 (price and count: Corvette Black Book)

      GM Heritage factory kit — 1979 Chevrolet Corvette, p.33.
    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.
    Astro — First generation (1985–1994)
    • 1986, 1987, 1993 Factory-verified internal

      1986 from the 1986 passenger van pages in the kit file labelled 1985.

      GM Heritage factory kit — 1985 Chevrolet Astro Van, p.5.
      GM Heritage factory kit — 1987 Chevrolet Astro Van, p.25.
      GM Heritage factory kit — 1993 Chevrolet Astro Van, p.12.
    Blazer (full-size, K5) — Square body (1983–1991)
    • 1983–1986 Factory-verified internal

      printed in the power team chart headings and the 1984 order guide

      GM Heritage factory kit — 1983 Chevrolet Blazer, p.4.
      GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.4.
      GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.6.
      GM Heritage factory kit — 1986 Chevrolet Blazer, p.6.
    Celebrity — A-body (1982–1990)
    • 1983 Factory-verified internal

      Tied to some axle ratios in the power-team tables; 1982 is not claimed: the 1982 page that names it (p.5) has no readable model-year field

      GM Heritage factory kit — 1983 Chevrolet Celebrity, p.5.
    C/K pickup — Square body (1983–1991)
    • 1984–1987 Factory-verified internal

      the 1984 (p.45), 1985 (p.36) and 1987 (p.51) kit pages print NA6 only in cross-references (1987 p.51 prints the option line code as NAG); 1986 p.166 prints the option line

      GM Heritage factory kit — 1984 Chevrolet Truck, p.45.
      GM Heritage factory kit — 1985 Chevrolet Truck, p.36.
      GM Heritage factory kit — 1986 Chevrolet Truck, p.166.
      GM Heritage factory kit — 1987 Chevrolet Truck, p.51.
    Chevy Van — Second generation G-series (1983–1996)
    • 1983, 1984, 1986, 1988, 1989, 1993–1996 Factory-verified internal

      .

      GM Heritage factory kit — 1983 Chevrolet Vandura, p.12.
      GM Heritage factory kit — 1984 Chevrolet G Van, p.14.
      GM Heritage factory kit — 1986 Chevrolet G Van, p.21.
      GM Heritage factory kit — 1988 Chevrolet Vandura, p.17.
      GM Heritage factory kit — 1989 Chevrolet G Van, p.17.
      GM Heritage factory kit — 1993 Chevrolet G Van, p.15.
      GM Heritage factory kit — 1994 Chevrolet G Van, p.36.
      GM Heritage factory kit — 1995 Chevrolet G Van, p.14.
      GM Heritage factory kit — 1996 Chevrolet G Van, p.43.
    Monte Carlo — fourth generation (1983–1988)
    • 1983–1984 Factory-verified internal

      1983: named in a power-team chart heading, which counts as the code's printing, as the own-entry lines print NAG, NAB and NAE

      GM Heritage factory kit — 1983 Chevrolet Monte Carlo, p.29.
      GM Heritage factory kit — 1984 Chevrolet Monte Carlo, p.36.
    Motor Home chassis (1983–1998)
    • 1983–1989 Factory-verified internal
      GM Heritage factory kit — 1983 Chevrolet Motorhome, p.5.
      GM Heritage factory kit — 1984 Chevrolet Motorhome, p.7.
      GM Heritage factory kit — 1985 Chevrolet Motorhome, p.13.
      GM Heritage factory kit — 1986 Chevrolet Motorhome, p.7.
      GM Heritage factory kit — 1987 Chevrolet Motorhome, p.11.
      GM Heritage factory kit — 1988 Chevrolet Motorhome, p.7.
      GM Heritage factory kit — 1989 Chevrolet Motorhome, p.9.
    S-10 pickup — First generation (1982–1993)
    • 1982–1985, 1987–1989 Factory-verified internal

      1984 from the C3A companion remark (the own line prints NAG)

      GM Heritage factory kit — 1982 Chevrolet S 10, p.8.
      GM Heritage factory kit — 1983 Chevrolet S 10, p.38.
      GM Heritage factory kit — 1984 Chevrolet S 10, p.18.
      GM Heritage factory kit — 1985 Chevrolet S 10, p.16.
      GM Heritage factory kit — 1987 Chevrolet S 10, p.16.
      GM Heritage factory kit — 1988 Chevrolet S 10, p.16.
      GM Heritage factory kit — 1989 Chevrolet S 10, p.40.
    Suburban — Square body (1983–1991)
    • 1984–1989 Factory-verified internal

      1984 from the power team heading; 1989 from the option weight table; the 1983 pages print NAG on the option line and power team heading and name NA6 otherwise only in restriction remarks, so 1983 is left out

      GM Heritage factory kit — 1984 Chevrolet Suburban, p.10.
      GM Heritage factory kit — 1985 Chevrolet Suburban, p.15.
      GM Heritage factory kit — 1986 Chevrolet Suburban, p.15.
      GM Heritage factory kit — 1987 Chevrolet Suburban, p.21.
      GM Heritage factory kit — 1988 Chevrolet Suburban, p.15.
      GM Heritage factory kit — 1989 Chevrolet Suburban, p.13.

    Related codes · mentioned in these notes

    C3ANAG

    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.