NB2 ✓ Factory-verified

Chevrolet · Regular Production Option

Emission system, California, Tier 0

Years 1963–81, 1994–95, 1998 Models 8 Factory citations 5

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Also described as Mandatory California emission controlExhaust Emissions (seen on 72 small-block V8s generally from Van Nuys but also seen on one KC L48 4-speed)Exhaust emissionCalifornia emission equipmentEmission system, California

Also documented for BuickGMCPontiac

Documented applications

Camaro →

• 1970s–1981 ● Confirmed

Chevelle / El Camino →

• 1972 ● Confirmed

Impala / Full-Size →

• 1963–70s (varies) ● Confirmed

Nova / Chevy II →

• 1975, 1979 ● Confirmed

C/K pickup — GMT400 (1988–2000) →

• 1998 ✓ Factory-verified internal
  ⛭ GM factory document — 1998 chevrolet chevy c pickup 2wd rpo code list, p.1.

Corvette — C4 (1984–1996) →

• 1994–1995 ✓ Factory-verified internal
  ⛭ GM Heritage factory kit — 1994 Chevrolet Corvette, p.64.

  ⛭ GM Heritage factory kit — 1995 Chevrolet Corvette, p.103.

Suburban — GMT400 (1992–1999) →

• 1998 ✓ Factory-verified internal
  ⛭ GM factory document — 1998 chevrolet chevy suburban 2wd rpo code list, p.1.

Tahoe — GMT400 (1995–1999) →

• 1998 ✓ Factory-verified internal
  ⛭ GM factory document — 1998 chevrolet tahoe 2wd rpo code list, p.1.

This page aggregates every documented appearance of NB2 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.