* The most common inline-six: A 215 cubic inch (3.5 liter) inline-six was a popular choice, known for its smooth operation and good fuel economy.
* V8s: Pontiac offered several V8 options, ranging in size and power:
* 287 cubic inch (4.7 liter) V8: A relatively small-block V8.
* 326 cubic inch (5.3 liter) V8: A more powerful V8, available in various horsepower ratings depending on the carburetor and other options. This was a very popular engine.
* 389 cubic inch (6.4 liter) V8: A larger, more powerful big-block V8. Available in a wide range of horsepower outputs, even exceeding 300 horsepower in some performance models.
* 421 cubic inch (6.9 liter) V8: A very powerful big-block V8, primarily found in their higher-performance models like the GTO. Offered in several horsepower versions, also.
To know the exact engine in a specific 1964 Pontiac, you would need to know the model (e.g., Tempest, LeMans, GTO, Catalina, Bonneville) and ideally the VIN (Vehicle Identification Number).
