* Cutlass 455 (Standard): 270 horsepower
* Cutlass 455 (W-30): 330 horsepower
* Cutlass Supreme 455 (Standard): 270 horsepower
* Cutlass Supreme 455 (W-30): 330 horsepower
* Toronado 455: 285 horsepower
The W-30 option was a performance package that included a higher-compression engine, a dual exhaust system, and a special camshaft, among other upgrades. This resulted in a significant increase in horsepower compared to the standard 455 engine.
Important Note: These are just a few examples. To determine the exact horsepower of your specific 1971 Oldsmobile 455, you would need to consult your owner's manual, a VIN decoder, or a specialist in classic car history.
