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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    NA5 Factory-verified

    Chevrolet · Regular Production Option

    Emission system, federal

    Years 1973–94, 1998 Models 30 Factory citations 102
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    Also described as Federal emission systemStandard (49-state) emissions equipmentStandard emissions systemFederal (standard) emissionsEmission system, standardEmission requirement, standardEmission system, federal, Tier 0Emissions, standard (federal)Emission system, federal, standard (satisfies high altitude requirements)Emission system, federal standardEmission system, standard emission equipment

    Also documented for BuickGMCOldsmobilePontiac

    Documented applications

    Corvette (C3)
    • 1981 Factory-verified

      $0.00; no count; factory kit lists RPO NA5 on the option index (p.5)

      GM Heritage factory kit — 1981 Chevrolet Corvette, p.5.
    Astro — First generation (1985–1994)
    • 1986–1988, 1993 Factory-verified internal

      standard emission equipment; some pages print NAS.

      GM Heritage factory kit — 1986 Chevrolet Astro Van, p.11.
      GM Heritage factory kit — 1987 Chevrolet Astro Van, p.25.
      GM Heritage factory kit — 1988 Chevrolet Astro Van, p.5.
      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.
    S-10 Blazer — First generation (1983–1994)
    • 1983, 1985–1989 Factory-verified internal

      some pages print NAS

      GM Heritage factory kit — 1983 Chevrolet S 10 Blazer, p.6.
      GM Heritage factory kit — 1985 Chevrolet S 10 Blazer, p.14.
      GM Heritage factory kit — 1986 Chevrolet S 10 Blazer, p.6.
      GM Heritage factory kit — 1987 Chevrolet S 10 Blazer, p.42.
      GM Heritage factory kit — 1988 Chevrolet S 10 Blazer, p.8.
      GM Heritage factory kit — 1989 Chevrolet Blazer, p.15.
    Camaro — Gen 3 (1982–1992)
    • 1982–1992 Factory-verified internal
      GM Heritage factory kit — 1982 Chevrolet Camaro, p.35.
      GM Heritage factory kit — 1983 Chevrolet Camaro, p.35.
      GM Heritage factory kit — 1984 Chevrolet Camaro, p.7.
      GM Heritage factory kit — 1985 Chevrolet Camaro, p.33.
      GM Heritage factory kit — 1986 Chevrolet Camaro, p.39.
      GM Heritage factory kit — 1987 Chevrolet Camaro, p.15.
      GM Heritage factory kit — 1988 Chevrolet Camaro, p.33.
      GM Heritage factory kit — 1989 Chevrolet Camaro, p.35.
      GM Heritage factory kit — 1990 Chevrolet Camaro, p.37.
      GM Heritage factory kit — 1991 Chevrolet Camaro, p.31.
      GM Heritage factory kit — 1992 Chevrolet Camaro, p.85.
    Celebrity — A-body (1982–1990)
    • 1989 Factory-verified internal

      the 1989 power teams page (p.5) prints the code as NAS, an S/5 swap that is not accepted, so 1989 is cited from the order guide

      GM Heritage factory kit — 1989 Chevrolet Celebrity, p.10.
    C/K pickup — Square body (1983–1991)
    • 1983–1987 Factory-verified internal
      GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
      GM Heritage factory kit — 1984 Chevrolet Truck, p.37.
      GM Heritage factory kit — 1985 Chevrolet Truck, p.36.
      GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
      GM Heritage factory kit — 1987 Chevrolet Truck, p.51.
    Corsica — L-body (1987–1996)
    • 1989–1990 Factory-verified internal

      the order guides print standard emissions; same description as beretta-gen1

      GM Heritage factory kit — 1989 Chevrolet Corsica, p.13.
      GM Heritage factory kit — 1990 Chevrolet Corsica, p.12.
    Corvette — C4 (1984–1996)
    • 1984, 1986–1994 Factory-verified internal

      the order guides call it standard emission equipment; the 1985 pages print NAS

      GM Heritage factory kit — 1984 Chevrolet Corvette, p.20.
      GM Heritage factory kit — 1986 Chevrolet Corvette, p.114.
      GM Heritage factory kit — 1987 Chevrolet Corvette, p.8.
      GM Heritage factory kit — 1988 Chevrolet Corvette, p.36.
      GM Heritage factory kit — 1989 Chevrolet Corvette, p.32.
      GM Heritage factory kit — 1990 Chevrolet Corvette, p.14.
      GM Heritage factory kit — 1991 Chevrolet Corvette, p.10.
      GM Heritage factory kit — 1992 Chevrolet Corvette, p.32.
      GM Heritage factory kit — 1993 Chevrolet Corvette, p.18.
      GM Heritage factory kit — 1994 Chevrolet Corvette, p.64.
    El Camino — fifth generation (1983–1987)
    • 1983–1987 Factory-verified internal
      GM Heritage factory kit — 1983 Chevrolet El Camino, p.5.
      GM Heritage factory kit — 1984 Chevrolet El Camino, p.5.
      GM Heritage factory kit — 1985 Chevrolet El Camino, p.11.
      GM Heritage factory kit — 1986 Chevrolet El Camino, p.5.
      GM Heritage factory kit — 1987 Chevrolet El Camino, p.45.
    Chevy Van — Second generation G-series (1983–1996)
    • 1983, 1984, 1986, 1989, 1993 Factory-verified internal

      standard emission equipment.

      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 — 1989 Chevrolet G Van, p.17.
      GM Heritage factory kit — 1993 Chevrolet G Van, p.50.
    Malibu — fourth generation, A-body (1983)
    • 1983 Factory-verified internal

      also satisfies high altitude requirements with LC3 and LG4

      GM Heritage factory kit — 1983 Chevrolet Malibu, p.21.
      GM Heritage factory kit — 1983 Chevrolet Malibu, p.23.
    Monte Carlo — fourth generation (1983–1988)
    • 1983–1984, 1986, 1988 Factory-verified internal

      1985 and 1987 are left out: those guides print NAS

      GM Heritage factory kit — 1983 Chevrolet Monte Carlo, p.34.
      GM Heritage factory kit — 1984 Chevrolet Monte Carlo, p.36.
      GM Heritage factory kit — 1986 Chevrolet Monte Carlo, p.34.
      GM Heritage factory kit — 1988 Chevrolet Monte Carlo, p.34.
    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.10.
      GM Heritage factory kit — 1989 Chevrolet Motorhome, p.9.
    Nova — NUMMI (1985–1988)
    • 1987–1988 Factory-verified internal

      the 1987 order guide says it also satisfies high altitude requirements; some pages print NAS

      GM Heritage factory kit — 1987 Chevrolet Nova, p.12.
      GM Heritage factory kit — 1988 Chevrolet Nova, p.10.
      GM Heritage factory kit — 1988 Chevrolet Nova, p.12.
    S-10 pickup — First generation (1982–1993)
    • 1982–1989, 1993 Factory-verified internal

      1984 from the MM5 and C3A companion remarks (the own line prints NAS); the 1993 guide prints it as federal

      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.14.
      GM Heritage factory kit — 1985 Chevrolet S 10, p.20.
      GM Heritage factory kit — 1986 Chevrolet S 10, p.8.
      GM Heritage factory kit — 1987 Chevrolet S 10, p.20.
      GM Heritage factory kit — 1988 Chevrolet S 10, p.30.
      GM Heritage factory kit — 1989 Chevrolet S 10, p.40.
      GM Heritage factory kit — 1993 Chevrolet S 10, p.10.
    Sprint — first generation (1985–1988)
    • 1985–1986 Factory-verified internal

      1985 from the power-team table's standard-emissions condition, which states the pairing with the engine outright (the 1985 ordering page prints NAS); 1986: the guide says it also satisfies high-altitude requirements

      GM Heritage factory kit — 1985 Chevrolet Sprint, p.10.
      GM Heritage factory kit — 1986 Chevrolet Sprint, p.8.
      GM Heritage factory kit — 1986 Chevrolet Sprint, p.14.
    Suburban — Square body (1983–1991)
    • 1984–1988 Factory-verified internal

      the kits print it as standard emission equipment; the merged K5 Blazer doc writes federal; 1984, 1987 and 1988 from the power team chart headings; the 1983 pages print NAS on the option line and power team heading and name NA5 otherwise only in a note on NA6 availability, so 1983 is left out

      GM Heritage factory kit — 1984 Chevrolet Suburban, p.9.
      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.15.
      GM Heritage factory kit — 1988 Chevrolet Suburban, p.9.

    Related codes · mentioned in these notes

    C3AGMCLC3LG4MM5NA6

    This page aggregates every documented appearance of NA5 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.