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

Pontiac's Super Duty engine was a potent racing machine, designed solely to dominate on the track, with exceptional power and ...

The car featured a 338 horsepower, four-barrel, 421 ... engine or 390-horsepower 428 H.O. While it may have been overlooked because of its luxury styling, under the hood, the Grand Prix had ...