[Daves55Sedan]

Well I don't know about the 4-bbl manifolds (guess I'm the only one left around here that still runs that old Ford EBU 2-bbl carb with the load-o-matic distributor). Anyway, on the '56 2-bbl manifold, if you turn the manifold upside down you would see the flared end of the copper tube recessed in the bore in the bottom of the manifold. That tube passes all the way thru the hollow heat riser passage and extends thru the top. It was a one piece tube, no fittings. The top of the tube connected directly to the bottom of the choke housing. Apparently, the tube is installed by pressing it thru from the bottom. Once the flared end at the bottom is all the way down, you turn it over and slide the cloth insulating jacket down over the tube and put the choke connector fitting on top. It was required to bend the copper tube over a little bit to get it to mate with the bottom of the choke housing, but that was the last thing that was needed to complete the installation.