How much horsepower does the 78 Trans Am have?

The horsepower of a 1978 Pontiac Trans Am varied depending on the engine option. The most common engine was the Pontiac 400 cubic inch V8. However, its horsepower rating wasn't a consistent number across the year due to emission regulations and other factors. You'll generally see figures ranging from 180 to 220 horsepower for the 400 V8 in a 1978 Trans Am. There were also less powerful 6-cylinder engines available, but those were considerably less powerful.