The Formula's big brother, the 1977 Trans Am, came with a base V8 that had 400 cubic inches and 180 horsepower. As before, the Trans Am's standard engine was optional in the Formula.

True to its name, the 1970 Formula 400 came standard with a 400 cubic-inch, 330-horsepower V8, while the optional 345-horsepower Ram Air III V8 engine (standard in the Trans Am) could also be ...

The iconic Trans Am (and the Firebird family at large) changed a lot from 1978 to the final model year in 2002, and, as you might expect, the WS6 package changed substantially over the years as well.

This is where the Trans Am joined the fun started by the 1977 party. The first engine customers could get on the Trans Am was the 6.6-liter (400ci) four-barrel V8.

The Trans Am sales exceeded 93,000 units, accounting for more than half of all Firebird sales for this model year. The Esprit was the next choice in terms of popularity, convincing close to 37,000 ...

This makes the '73 and '74 Super Duty 455 Trans am and Formula Firebirds all the more amazing. The pony-car market hit its high point at 1968 with an 11-percent market share.