S/S Pressure Tank

That small hose/pipe likely goes to the front of the car, to one of the pipes just before the radiator. A factory effort to help bleed the car.
Any air would need to be pushed 'down' then back, then up to the tank. I'd just cap it at the radiator.
Chuck

Does anyone else have an opinion on this?(not that I don't value Chuck's,but I would like to hear what everyone else thinks)I bought a lay-down radiator from Pantera Performance(a work of art)and the instructions say something about this but they are very vague.My car has the small nipple on the steel tube going the rear of the car.It says to weld this shut and run a 1/4" line back to the pressure tank.Where would I attach it though?My pressure tank dosn't have a nipple on it.Is it necessary?
Thanks,
Ron

Chuck is correct. Ford went through incredible gyrations in trying to engineer an automatic radiator air-bleed system (without spending much money, of course!) First, there was the dual air-bleed needle valves at the top corners of the radiator. Then, the right bleed was changed to a small rubber hose about 18" long that went down to the 'return' radiator pipe. The final iteration was the same small rubber tube that went all the way below the car & back to the surge tank. Ford apparently believed that the all overheating problems stemmed from a radiator air pocket but proper bleeding techniques were far too exotic for the average Pantera owner. Practically speaking, the dual needles work the best IMHO but do take some common sense to use. The extra bib on the pipe or tank can be plugged off without harm (or cut off & the hole TIG-welded closed). My Sept '72 L model came only with the 2 needle valves so the small-hose adventures were '73-74.

Jack,
FYI, my Pre-L '72 (April 72 build date) has the long tube and single rad. bleed. It could have been an update but based on the condition of the hoses and type of clamps, I'd say my set up was factory orginal until I replaced all the hoses last week.