Okay, I guess that it's time to fess up. I owe it to those of you who were so kind as to throw in your two cents and good advice. So the story goes, I was prepared to pull the head and get it magnafluxed, etc, etc. Well I was borrowing a space in the shop of a friendly mechanic here in Toluca, he said, let's think about this for a minute, it doesn't add up. We both agreed that it didn't add up but were just left scratching our heads. I won't go into all the details, you can search the old topics to see. It was called "revisiting the radiator issue", I think. Anyway, I pulled the radiator, and fan, then the water pump. I stopped to look at the water pump to see if it might be THE source of the problem or at least part of the problem. It looked fine, but then we looked closer, and compared it to another that he had in the shop from the same approximate year 4.6 Liter motor. Well, here it is....The guy who had owned this motor before me had put on the wrong one!!!! Serpentine belt variety I guess, with reverse rotation. I never thought to look at that when I bought the motor last August. I pulled everything apart and just put it back together. My bad!!! So I merely purchased the correct one, and the beast runs great! A testament to the durability of the inline six, that you can run around for 9 months like this and it didn't kill it. And point #2, lesson learned, thankfully not the hard way with a blown head or worse. Thanks again to all for your input. Take care, Rob