What is the horsepower rating on 1975 Chevy small block 400?

The horsepower rating of a 1975 Chevy small-block 400 varied depending on the specific application (vehicle it was installed in) and the optional equipment. There wasn't one single horsepower figure. However, it generally ranged from around 150 to 175 horsepower. The lower figures reflect the impact of emissions regulations that reduced power output compared to earlier, pre-emissions era 400s.