"T/A 6.6" 400 high-output (200 hp ’77, 220 hp ’78–79)

Years 1977–79 Models 1

Documented applications

1977–1979 Disputed

Trans Am/Formula, 49-state; Wikipedia extends W72 usage to the ’80–81 301; 78ta treats it as 400-only

Grade note: confirmed (77–79), disputed (80–81)

This page aggregates every documented appearance of W72 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.