Pontiac Trans Am 455
The 1971 Firebirds and Trans Ams were practically identical to the 1970 models. Still, they represented one of the best muscle cars on the rapidly changing market. And 1971 proved to be the last true muscle car model year buyers could get those high powered and legendary engines.
The 455 V8 delivered 335 HP. But most muscle car enthusiasts argue that Pontiac underrated the numbers. Even with the higher compression in the Trans Am H.O. version, that 455 V8 had the same horsepower figure. So, the real output was closer to 400 HP with a corresponding performance and top speeds.