BS1 ✓ Factory-verified

Chevrolet · Regular Production Option

Quiet Sound Group (acoustic insulation)

Years 1970–80 Models 3 Factory citations 1

Also described as Body insulationQuiet sound group

Documented applications

Camaro →

• 1970s ● Confirmed

Impala / Full-Size →

• 1980 ✓ Factory-verified
  ⛭ GM Heritage factory kit — 1980 Chevrolet Impala, p.69.

Nova / Chevy II →

• 1974–1975 ● Confirmed

This page aggregates every documented appearance of BS1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.