Coolant hose placement on the radiator

Your drawings are right! And YOU are right! The bottom hose(to the radiator) COMES from the pressure tank(beside the right engine head). And the TOP hose GOES back to the WATER PUMP!! YES! It is the opposite of what we were taught in Physics; and opposite to what all American auto manufacturers follow. I.E. Since heat rises the HOT water should flow into the top and the cooler water flows out of the bottom, so the rising heat does NOT heat-up the allready cooled water. This has been debated many times by yours truely. The "Experts" want you to believe that there is no difference; But I say different, and you are the first to be in agreement. If you can reroute to put the hot water in at the top, I say it will make a difference in your cooling efficientcy. The "Double Pass" feature means: The very early radiators had both IN and OUT tubes going to the same side "Tank" (same as they always have been), and the water pretty much went in the direction it wanted. In Later radiators, the tank was DIVIDED between the the IN and OUT ports by a soldered in Baffle(between the ports); this forced the water to flow through one half, turn around in the other tank at the far side, and then flow back through the other half of the radiator. Hence the term "Double Pass" Radiator. This improvement helped with some overheating problems. To this day I still say "The Hot water is suppose to go in the TOP, ALL the american Manufacturers do it this way FOR THE REASON ALLREADY EXPLAINED. Marlin.

Early Pantera dwgs show the water pipes rigged one way while later ones mention the opposite hook- up. I once tried it BOTH ways the same day on the same car and got no measurable change in engine temp.Almost all Pantera radiators are "double bypass"'- that is, water goes across the core twice. Early stock radiators were bisected front-to-back with a radiator baffle in the tank while later ones were bisected top-to-bottom. The early method didn't work well & was recalled by Ford; the baffle changed (if it hasn't already broken loose!) There is no extrernal way to tell one from another. To check, insert a wire, a welding rod etc into the upper rt bleeder hole. If it goes on;y half-way across, the original (bad) baffle design is in place. If it reaches all the way to the front of the tank, the late baffle is installed. A radiator shop can change the baffle location while rodding out the radiator, but practically speaking, the poor thing if stock is 33 yrs old and probably needs replacement regardless. There are many aftermarket units available from the vendors, all of which are better than an old stocker of either configuration IMHO.