Ok, so I'm putting my motor together (still lol) and noticed the heads have a coolant "port" between (as installed on engine) the #6 and #8 cylinders. Same one that's used for the coolant temp sensor on the drivers side. My heater hoses now run from the front of the intake to the heater core, then from the core to a fitting near the top of the radiator. Not sure if it will clear headers (don't have them YET) but with the stock under the plug manifolds, it would be fine. Wouldn't the water coming out of that port be about as hot as you could get? I have a feeling that would get the interior a little warmer in the summer if so, but to be honest, I would rather be too hot in the summer than too cold in the winter. (without carpet/insulation, it gets warm inside anyways) I want a defroster that works great, and I want the interior to be well heated if possible. Also just curious if perhaps that water could be TOO hot, and perhaps hurt the hose and/or heater box seals. The heavy duty heater does a fairly good job, but it just doesn't seem that the heater core is hot enough in the winter for the "high" fan position to be effective. It moves a lot of air, but feels as if so much that it comes out cool. One position slower on the fan, and you can feel how hot the air is, but it just doesn't circulate about the truck enough on that setting. I've never personally seen or heard of this attempted. With the TPI setup, this port, the front of the intake, (actually faces the front of the truck behind the alternator) or the top of the water pump are my only possible sources of heat, and I figure the much shorter hose would be a nice benefit. Could strap the plug wires to it as well. /forums/images/graemlins/smile.gif Any comments or experience?