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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

    GMC · Regular Production Option

    Emission system, high altitude

    Years 1983–89 Models 8 Factory citations 33
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    Also described as Emissions, high altitude

    Also documented for Chevrolet

    Documented applications

    Caballero — G-body (1983–1987)
    • 1983–1984 Factory-verified internal

      Shared G-body platform code; cited from the joint El Camino/Caballero pages of the Chevrolet El Camino kits

      GM Heritage factory kit — 1983 Chevrolet El Camino, p.5.
      GM Heritage factory kit — 1984 Chevrolet El Camino, p.5.
    Jimmy (full-size) — Square body (1983–1991)
    • 1983–1986 Factory-verified internal

      printed in the power team chart headings; shared square-body platform code; cited from the Chevrolet Blazer kit

      GM Heritage factory kit — 1983 Chevrolet Blazer, p.4.
      GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.12.
      GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.6.
      GM Heritage factory kit — 1986 Chevrolet Blazer, p.6.
    Jimmy — first generation (1983–1994)
    • 1987, 1989 Factory-verified internal

      shared S/T platform code; cited from the joint S-10/15 Blazer/Jimmy pages of the S-10 Blazer kit

      GM Heritage factory kit — 1987 Chevrolet S 10 Blazer, p.42.
      GM Heritage factory kit — 1989 Chevrolet Blazer, p.15.
    Safari — First generation (1985–1994)
    • 1986–1988 Factory-verified internal

      ; printed in the power team chart headings; years follow the dates printed on the pages, not the kit file names (the 1987 kit's page 24 is dated September 1987, so it supports 1988); 1986 from the 1986 pages in the kit file named for the prior model year; shared M-body code; cited from the joint Astro/Safari pages of the Astro kits.

      GM Heritage factory kit — 1985 Chevrolet Astro Van, p.24.
      GM Heritage factory kit — 1987 Chevrolet Astro Van, p.12.
      GM Heritage factory kit — 1987 Chevrolet Astro Van, p.24.
    Sierra — Square body (1983–1991)
    • 1984–1987 Factory-verified internal

      shared platform code; cited from the square-body C/K pickup kits; 1984 and 1985 from the power team blocks headed with NA6 high altitude emissions; 1987 from the roof marker lamp requirement remark (the 1987 option line prints NAG)

      GM Heritage factory kit — 1984 Chevrolet Truck, p.21.
      GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
      GM Heritage factory kit — 1986 Chevrolet Truck, p.166.
      GM Heritage factory kit — 1987 Chevrolet Truck, p.58.
    Sonoma — first generation (1982–1993)
    • 1983–1985, 1987–1989 Factory-verified internal

      1984 from the C3A companion remark (the own line prints NAG); 1988 from the power team heading for high altitude emissions; 1989 from the joint data book's weight page; shared S-series code; cited from the joint S-10/S-15 pages of the S-10 kits

      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.80.
      GM Heritage factory kit — 1989 Chevrolet S 10, p.21.
    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; shared square-body platform code; cited from the Chevrolet Suburban kit

      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.
    Vandura and Rally — Second generation G-series (1983–1996)
    • 1983, 1984, 1986–1989 Factory-verified internal

      1987 from the power team block heading; shared G-van platform code; cited from the Chevrolet G-Van kit

      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 — 1987 Chevrolet G Van, p.42.
      GM Heritage factory kit — 1988 Chevrolet Vandura, p.17.
      GM Heritage factory kit — 1989 Chevrolet G Van, p.17.

    Related codes · mentioned in these notes

    C3A

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