He was saying that the 6.0 is plumbed different than the 7.3s OBS and superduty. So yes I agree on your truck and mine the hotest coolant is out of the block line then return to the pump. On the 6.0 the heater core return goes to the degas bottle and not the pump. So whether it may not be as hot or as much flow as us, alll he has for a heat source is the line off the water pump.Clay nice idea using the pump and great photos as well. I think I see a problem with your coolant plumbing and you can generate more heat if you re-plumb the flow. The hottest coolant is the hose coming out of the head. That's where my tee is and that very hot coolant travels through my components. My coolant return is a tee to the hose going to the water pump. If your hottest coolant is tee'd to the hose to water pump you're missing out on a few degrees of free heat because that's the coolant return line.