I just spent the afternoon at a buddies house getting his truck ready for an upcoming wheelin' trip. He's got a 77 Jimmy frame (stretched 18 inches) and drive train with an International crew cab pick body. We've had a terrible time with it overheating and here are a few things we've tried: -Original International radiator -Full size Chevy radiator -Two radiators (smaller one in front of bigger one) -Stock fan -Electric fan -Stock and electric fan -New fluids -New hoses -2 electrical and 2 mechanical temp gauges -3 different temp thermo's (160,180,190?) and no thermo -High flow water pump We've chased down all of the gremlins we can think of. We've heard rumors that a lean running carb can make a truck run hot, but wouldn't it just run piss-poor if it was that lean? Could the location of the engine/radiator in the engine bay have anything to do with it? I've heard another rumors Chevy's overheat if there is more that 50% antifreeze in the mixture..... Any thoughts/ideas would be great. We've been working at this for a while, and we're going to go bald from scratching our heads for so long!