How much horsepower does a 1980 olds 350 have?

The horsepower of a 1980 Oldsmobile 350 engine varied depending on the specific model and trim level of the car it was in. There wasn't a single horsepower rating for all 350s that year. You'd need to specify the vehicle (like a Cutlass, Delta 88, etc.) to get a more accurate answer. However, expect the horsepower to generally be in the 150-180 hp range. Output was lower than earlier, larger displacement Oldsmobiles due to emissions regulations.