Yes,it's water cooled. I don't have a radiator yet. I'm not sure if this engine has the power to do the job yet. While ground testing I'll connect a water hose to it. No sense in making a lot of stuff just to find out it won't work. I already had this engine so I thought it would be a good place to start. The engine has been modified but I don't know to what extent. A stock 440 is about 27 hp.