The horsepower of a 1971 Oldsmobile 455 Rocket in a Ninety-Eight varied depending on the specific configuration and carburetion. There wasn't just one number. However, it generally ranged from
approximately 310 to 365 horsepower. The lower numbers reflect the output with the lower-performance versions, while higher numbers were associated with higher performance models.
To know the exact horsepower for a specific 1971 Oldsmobile Ninety-Eight with a 455, you would need to look at the vehicle's original documentation (owner's manual, build sheet, etc.).
