yeah, after more research I've tested head-gaskets by putting the overflow tube into a jar of water and my head-gaskets are leaking (slightly) with no oil in coolant or coolant in oil. Truck runs fantastic though and has no steam or vapor in exhaust. Maybe yours is the same. I'm either ditching it or going all the way through the motor with headers and the works.... Brad

have you figured out the overheating yet ? I'm having that trouble. If my gaskets are swapped I'd be happy to replace them, just don't want to tear it down until I've triend everything else but I think I'm there....