How much hp is 305 cc?

it depends if it from an el camino probably not much but if it is from like a car like a camaro it will have more to answer the guestion maybe 250-350

The question was 305cc , not 305 cubic inches (5000cc) . 305 cc is about 18.6 cubic inches So this does not refer to a car engine. This size engine as used in a snowblower usually develops 8-11 horsepower , the same size engine in a high performance motorcycle could develop 25 -50 horsepower.