How much horsepower does a 1978 Chevy 305 small block have?
The horsepower of a 1978 Chevy 305 small block varied depending on the application (the vehicle it was installed in) and the specific carburetor and other options. There's no single answer. However, the range was generally between 135 and 170 horsepower. You'd need to know the specific vehicle model to get a more precise figure.