Pontiac's 455 ci V8 engine was its largest ever, ideal for muscle cars in the 1970s for torque and lower emissions. The 421 ...

AMC tended to keep things simple with its range of V8 muscle car engines, only offering differing sizes built on the same block throughout its relatively short history. It preferred to develop ...

It was a six-cylinder engine meant to be powerful enough to ... people just didn't want big muscle cars anymore and GM was forced to downsize just to be able to stay on the market.