On Buick’s behalf, that responsibility befell ... The 7.5-liter V8 produced 315 to 330 horsepower and 450 to 455 lb-ft of torque (depending on a single or dual exhaust option), offering plenty ...

There were 2,472 examples of the Stage 1 455-cube ... than the Buick’s 3.42:1. Still, the big-block GS455 also has a few extra horses and lb-ft tucked under the hood: 290 hp and 390 lb-ft ...