Make no mistake though, the 421 engine's true calling was racing. Crate ... cars are not. Pontiac looked at following up its popular Ram Air III and IV engines, the brand's performance range ...

The engine certainly ticked Pontiac's performance box ... Pontiac ended up offering the powerplant as an over-the-counter crate engine for independent racing teams, as well as part of a Super ...

With the Chevrolet Performance ZZ632 crate engine as its benchmark ... 1987 Buick Regal Turbo-T (2 of them), 1993 Pontiac Firebird Formula (Project Thunderchicken), 1989 Pontiac Firebird Formula ...