It is a 2tc Toyota engine. It cools fine , there is also a small heater core from a rear heater off a four runner up by the pedals. The heater does very little with no windows. You cannot see from the photo , but there is about a four inch gap between the radiator and the fuel tank with a titanium heat shield to keep the fuel from boiling. That aluminum piece with the decals was meant to scoop a little more air through the radiator. I originally set the fans up with a 40 amp constant duty relay from the fan switch and separated the fans on individual circut breakers. It worked great for a number of years, but it started cooking fan switches and the relay. I think I have a bad fan causing too much resistance? That will be this summers mistery I guess.