The Pontiac 428 cubic inch engine was used only from 1967-69. It was one of the largest engines Pontiac produced, but it was used more to power big cars such as the Bonneville, and not as much for performance cars such as the Firebird. Since that time it has been used as a performance engine in several cars by drag racers.
The Pontiac 428 engine was a bridge between two engines, which meant the 428 had a short lifespan. The engine remains popular with performance car enthusiasts, but in 1969 the factory only installed them in larger cars. Sometimes you could get a dealer to install one in a Firebird, and the engine was at times used in NASCAR racing. In 1967 the 421 engine was bored out to become a 428.