How much horsepower does a 1975 350 have?
The horsepower figure for a 1975 350 V8 varies by model and configuration, but most 350s used in GM passenger cars produced roughly 145–165 net horsepower, with some higher-output variants around 170–180 hp depending on the model and emissions setup.
Context: why the numbers vary
In 1975, U.S. automakers reported net horsepower (the rating used by the EPA) rather than the older gross horsepower. Emissions controls, fuel delivery, compression, cam timing, and exhaust restrictions all influenced the final figure. California-market engines often faced stricter tuning and slightly lower ratings as well.
Key variables that influence horsepower
Several factors determine the exact number for a given 350 V8, including carburetion (two-barrel vs four-barrel), exhaust configuration, intake/cam design, compression ratio, and whether the engine was built for cars, light-duty trucks, or California emissions requirements.
Typical configurations and their horsepower ranges
Below are common 1975 350 configurations and the approximate net horsepower ranges you might encounter in that year. These figures reflect EPA net ratings rather than the earlier gross ratings.
- Chevrolet 350 with a two-barrel carburetor: typically around 145–155 hp (net).
- Chevrolet 350 with a four-barrel carburetor: typically around 165 hp (net).
- California-certified or stricter-emissions variants: roughly 150–160 hp (net).
- High-output or performance-oriented 350s in select models (where offered): roughly 170–180 hp (net).
Numbers vary by model year and exact setup; for an exact figure, refer to the vehicle’s build sheet or factory documentation for that specific car.
Brand and model notes
GM used the 350 V8 across several brands in 1975, including Chevrolet, Pontiac, Buick, and Oldsmobile. While the displacement was the same, each division tuned the engine differently to balance performance, economy, and emissions. Common applications included the Chevrolet Chevelle and Monte Carlo lines, the Pontiac Firebird, the Buick Century, and various Oldsmobile and GMC trucks.
How to confirm the exact horsepower for a specific vehicle
To verify the precise horsepower of a particular 1975 350 engine, check the vehicle’s build sheet or VIN code, consult the factory service manual, or rely on historical factory catalogs. Engine-code stamps on the block can indicate the exact version (2V vs 4V, emissions spec, etc.).
Summary
There isn’t a single horsepower value for a 1975 350. Most passenger-car 350 V8s delivered net ratings in the mid-140s to mid-160s hp, with four-barrel and performance configurations approaching the upper 160s to around 180 hp. For an exact figure, identify the specific model and configuration and consult the corresponding factory documentation.
