What is the horsepower for a 1966 Pontiac gto 389 engine?

The horsepower for a 1966 Pontiac GTO 389 engine varied depending on the specific engine option chosen. There wasn't just one horsepower rating. The most common options were:

* 325 hp: This was the standard output for the 389 cubic inch V8.

* 360 hp: A higher-performance version of the 389 was available with this horsepower rating.

So, there's no single answer without knowing the specific engine code on the car.