My grandpa has a 2-70 white that's overheating. New t stat and water pump from a recent headgasket job. He says it has done it a long time ever since he had the pump shop go through the pump. It was supposed to be turned up 10 percent. It only overheats when working it hard. Ask the passages we can get at with the head off are clean and the radiator is clean as well. It seems there is allot in front of the radiator like the air and precleaner as well as the trans and powershift cooler. Going to dyno it to check power and if its not excessive then going to look into getting more air across the radiator. Anyone here have any ideas or things to look for