How much horsepower does a 318 V8 5.2L have?

The horsepower of a 5.2L (318 cubic inch) V8 depends heavily on the year and application. There's no single answer. These engines were produced over many years with different configurations and levels of tuning. Output ranged from roughly 140 to 230 horsepower. To get a precise figure, you'd need to specify the year and model of the vehicle the engine was in.