Typically, the 5.7-liter (350 cubic inch) V8s used in 1991 Chevrolets produced about 210–230 horsepower, with higher-output variants around 245 horsepower. The exact figure depends on the model and engine calibration.
Because the 1991 Chevy 350 could refer to several different cars and trucks, horsepower varied by model and engine setup. This article outlines the common ranges and explains how to verify the exact number for a specific vehicle.
What the 1991 350 means across GM lines
In 1991 GM deployed the 5.7L V8 in a variety of vehicles, including light-duty trucks, SUVs, sedans, and the Corvette. Engine calibrations ranged from throttle-body injection to multi-port fuel injection, and emission controls affected the rated horsepower. The most familiar figures for everyday GM models sat roughly in the 210–230 hp band, while certain high-performance configurations approached the mid- to upper-240s.
Common horsepower ranges for the 1991 350 V8 across popular GM offerings:
- Light-duty trucks and SUVs (C/K series pickups, Suburban, Tahoe) with the 5.7L V8: approximately 210–230 horsepower (SAE net).
- Chevrolet Corvette C4 with a 5.7L V8: around 245 horsepower (SAE net) in this era for the higher-output 350 configurations.
Note: Exact horsepower depends on the specific model, drivetrain, and options. Checking the build sheet or RPO codes for the vehicle will yield the precise figure.
Why horsepower figures vary
horsepower numbers varied due to engine calibration (carbureted vs. fuel-injected), emissions controls, and whether the rating cited is SAE net (what went to the wheels) or another standard used in brochures. The 1991 year sits in a transition period where multiple 350 configurations coexisted across GM's lineup.
How to verify the exact horsepower on a 1991 Chevy 350
To determine the precise horsepower for a specific vehicle, you should identify the exact engine configuration and options using factory codes and documents.
- Check the RPO codes inside the glovebox or on the door jamb to identify the engine variant and its horsepower rating.
- Look for the engine code stamped on the engine block or intake and cross-reference it with GM's RPO/horsepower lists from that era.
- Consult the vehicle’s window sticker, owner's manual, or build sheet for the stated horsepower and engine configuration.
Because the 1991 350 was used in multiple models with different calibrations, the exact horsepower can only be confirmed by the specific vehicle’s documentation and engine code.
Summary
The 1991 Chevy 350 typically delivered about 210–230 horsepower in most trucks and passenger cars, with Corvette variants often around 245 horsepower. The precise figure for a given vehicle depends on the engine code, fuel system, and emissions setup. To know the exact number, consult the vehicle’s build sheet, RPO codes, and engine stamping, or reference the window sticker for that particular car or truck.