Pontiac Firebird Trans Am 455 SD
In 1974 Pontiac completed the first restyling of the whole Firebird range. With the new front and rear end came an improved interior and other details. They carried the SD 455 model over from 1973, but in the new package, it featured an upgraded suspension and brakes.
The standard 455 V8 delivered only 215 HP. However, in SD trim, it developed 290 HP, which was absolutely fantastic for 1974.