Federal emission system

Years 1973–82 Models 4 Factory citations 2

Also described as Standard (49-state) emissions equipmentStandard emissions system

Documented applications

Camaro

late 1970s Confirmed

internal

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.

Nova / Chevy II

1979 Factory-verified

GM Heritage factory kit — 1979 Chevrolet Nova, p.56.

C/K Trucks

1973–82 Confirmed

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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.