What engine was in a 1975 Chevy truck?
Chevrolet offered multiple engines in its 1975 pickup lineup; the most common powerplants were the 350 cubic inch small-block V8 and the 250 cubic inch inline-six, with larger V8s like the 400 and 454 available on heavier-duty models. So, there wasn’t a single engine that powered every 1975 Chevy truck—the engine depended on the model and option package.
Engine options in the 1975 Chevy truck lineup
Across the light-duty C/K line, buyers could choose from three families of powertrains: a gasoline inline-six for efficiency, and several V8 options for more torque and towing. Availability varied by cab/bed configuration and trim.
Inline-six option
For buyers prioritizing reliability and economy, Chevrolet offered a straight-six engine that was commonly paired with base trims and fleet configurations.
- 250 cubic inch (4.1 L) inline-six
In this period, the 250 I6 was a workhorse choice on base models and mid-range configurations, balancing performance with economy.
V8 options
Those seeking more power or towing capability could opt for V8 powerplants. The lineup included several small-block V8s along with at least one big-block option for heavier duties.
- 350 cubic inch small-block V8
- 400 cubic inch small-block V8
- 454 cubic inch big-block V8 (available on heavier-duty models)
These V8 engines provided a range of torque and horsepower suitable for work trucks, towing, and hauling heavier loads.
How to verify the engine in your specific truck
To confirm the exact engine in a particular 1975 Chevy truck, check the vehicle’s data plate and the engine block stamp. The VIN and RPO codes on the glove box build sheet or door sticker can help identify the factory-installed engine. If you have access to the engine, the block pad or stamping will reveal the displacement and code for the original engine.
Dealers or classic-truck reference guides also list which engines were paired with which model and option package for the 1975 year.
Summary
In short, a 1975 Chevy truck did not have a single engine. The lineup offered a 250 inline-six for economical service models and a range of V8s, most commonly the 350, with larger 400 and 454 options on heavier-duty configurations. Engine choice depended on the model, cab/bed setup, and optional equipment, meaning owners could tailor their pickup to work or daily driving needs.
