Authenticity reference

Cylinder-head casting family

date correctness · reported

1976 Pontiac Firebird Trans Am 455 exterior with the hood raised; exact-year 455 model context, not four-speed or individual-car authentication evidence. 1976 Pontiac Firebird Trans Am 455 4-Speed

Reference Details

Common issue: Earlier/later Pontiac heads can be swapped during rebuilds.
Confidence: reported
Correct value: 1976 455 used carryover 6H heads, with 6S noted for California applications
Where to check: Center exhaust-port casting area on Pontiac D-port cylinder heads

Cars With This Authenticity Marker

1 linked car page.

1976 Pontiac

1976 Pontiac Firebird Trans Am 455 4-Speed

1976

Sources & Documentation

Hemmings 1974-87 Pontiac Firebird Trans Am buyer guide