52. Chevrolet El Camino SS
The El Camino was conceived as a half-car/half-truck for carrying light loads. But in 1970, Chevrolet introduced the wildest El Camino of all in the form of the El Camino SS 454 (via Hemmings).
The mighty 454 V8 LS6 was a 7.4-liter Chevrolet big block engine with a 450 HP official rating. The engine delivered around 500 HP in real life. In the El Camino SS, this engine provided significant performance numbers close to the best regular muscle cars of the day.