331 ◑ Single-source

Pontiac · Regular Production Option

Firebird (OHC-6 1-bbl) — model

Years 1967–68 Models 1

Also described as Mirror Group

Documented applications

Firebird / Trans Am →

• 1967 ◑ Single-source

  Model sales code

• 1968 ◑ Single-source

  Was "Firebird model" in 1967 — codes shift year-to-year

This page aggregates every documented appearance of 331 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.