What is the factory tire size on a 1963 Chevrolet impala?

The factory tire size on a 1963 Chevrolet Impala varied depending on the model and options. There wasn't one single size. However, the most common sizes were:

* 7.50-14: This was a very common size for the 1963 Impala.

You might also find some with slightly different sizes, but 7.50-14 is the best starting point for your research if you're looking to restore or replace tires. Checking a build sheet or original owner's manual (if you have them) will give the definitive answer for a specific car.