How much hp does a Chevy 350 big block have?

There's no single answer to how much horsepower a Chevy 350 big-block has. The "Chevy 350" refers to the engine's displacement (350 cubic inches), but the horsepower varied wildly depending on the year of manufacture, the specific model (different versions existed for different applications – trucks, cars, etc.), and any modifications made.

A stock 350 big-block from the late 60s or early 70s might have produced anywhere from 250 to 350 horsepower, while others could be significantly higher or lower depending on the year and model. Aftermarket modifications could easily increase or decrease that number. So, without knowing the specific year and model of the engine, it's impossible to give a definitive horsepower figure.