* Small-Block V8s:
* 307 cubic inch (5.0L): A common and relatively low-powered option.
* 350 cubic inch (5.7L): This was a very popular choice, available in various horsepower ratings depending on the carburetor and other components. Horsepower ranged considerably, from under 300 hp to well over 300 hp depending on the specific configuration.
* 400 cubic inch (6.6L): A larger and more powerful small-block V8.
* Big-Block V8s:
* 396 cubic inch (6.5L): Available in several horsepower variations, this was a powerful engine option.
* 454 cubic inch (7.4L): The largest engine commonly offered, providing substantial horsepower.
It's important to note that the exact horsepower figures varied significantly depending on the specific configuration (carburetor, intake manifold, etc.) of each engine. A given engine option could have multiple horsepower ratings in a single model year. You would need to know the specific Chevelle's options code to know the precise engine installed.
