How much horsepower does a 1974 buick 455 have?

The horsepower of a 1974 Buick 455 varied depending on the model and the specific engine configuration. There wasn't a single horsepower rating. You'd find figures ranging from approximately 210 hp to 250 hp, with some variations even higher or lower depending on carburetion, emission controls, and the specific application within different Buick models. You'd need to know the exact model of the Buick (e.g., Electra, LeSabre, etc.) to get a more precise figure, and even then, there can be slight variations.