NB2 ● Confirmed

Chevrolet · Regular Production Option

Exhaust Emissions (seen on 72 small-block V8s generally from Van Nuys but also seen on one KC L48 4-speed)

Years 1963–81 Models 4

Also described as Mandatory California emission controlExhaust emissionCalifornia emission equipment

Documented applications

Camaro →

• 1970s–1981 ● Confirmed

Chevelle / El Camino →

• 1972 ● Confirmed

Impala / Full-Size →

• 1963–70s (varies) ● Confirmed

Nova / Chevy II →

• 1975, 1979 ● Confirmed

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.