The horsepower of a 318 engine depends entirely on the *application*. "318" refers to the engine's cubic inch displacement, not a specific model. This engine size was used in various vehicles (cars, trucks, boats) over many years by Chrysler, and the horsepower varied considerably depending on the year, model, and modifications.
You'll need to specify the *make and model of the vehicle* the 318 is in to get a precise horsepower figure. Even then, the horsepower could vary slightly depending on the year and specific options.
