* Small-Block V8s: These were the most popular choices. Options included:
* 250 cubic inch (4.1L) straight-6: A base engine, offering good fuel economy but less power.
* 307 cubic inch (5.0L) V8: A relatively small V8, providing a balance of power and economy.
* 327 cubic inch (5.4L) V8: A more powerful option, available in various horsepower ratings depending on the carburetor and other components.
* 350 cubic inch (5.7L) V8: Another popular choice, also offered in several horsepower variations.
* Big-Block V8s: These were high-performance options:
* 396 cubic inch (6.5L) V8: Offered in several horsepower ratings, including a high-performance version.
* 427 cubic inch (7.0L) V8: A very powerful engine, usually found in higher-performance Impalas.
It's important to note that the exact horsepower ratings varied depending on the specific engine configuration (e.g., two-barrel or four-barrel carburetor, different camshafts). A dealer's brochure or a comprehensive Chevrolet parts catalog from 1969 would give the most precise details on all available engine options and their specifications.
