The metal coolant tube under the intake on the 390 engine can I use a rubber line and run it like that or do I need that metal line and if so what is it called? I can't find my original. It goes from the water pump rubber to metal line back to rubber and into the fire wall thanks!!!!

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I would guess the reason for that metal pipe is it will handle the heat under the intake manifold and on top of the lifter cover better than a rubber heater hose will. It runs right under the choke tube in the intake manifold and the paint always burns off of there because of the heat.

If you are going to replace it with a rubber hose I think it would be a good idea to put some insulation over the hose. I would try to find the metal tube or get another. They are not hard to come by.

Haris, Ian is correct regarding the extra protection from the heat in that area, especially from the fire hot exhaust gasses crossing over it in the intake channel. I have a good stock of these and sell in nice solid condition with both mounting flanges for $25. I also have a couple that I have cleaned, bead blasted and painted with the Bill Hirsch Cadillac Engine paint for $45. You can see one example by Clicking Here The pipe is held in place I the rear via the right rear intake manifold bolt, but has a separate bolt at the front which you will need which I can throw in with the pipe. I can ship to your address in KY 2-3 day Priority for $10.  If interested in one shoot me an email to jasonedge@nc.rr.com

Sorry for the late reply now that I have what it looks like I'll try and find it but if not consider it sold thanks I'll let you know

Hey Jason I found the part I needed thought it was the transmission tube.... lol guess I over looked it appreciate the help ian and Jason thanks

Always good to find something you have misplaced and you are correct that it is about the same diameter as the transmission filler tube.

Yes glad to have it 

Did some cars come without that tube? My car has hoses routed to the inner fender with a clip that secures both. I thought someone just threw out the pipe and did it that way but the clamp used looks to be factory and some add on part.

A limited # were routed over to the RH inner fender dust shield. See illustrations below:

Whats the benefit with this? Was one setup for cars in warmer climate and the other for cars in colder? Or what could have been the reason? I mean, it did cost Cadillac extra money to have two setup.

Might just be an improved design on the later ones perhaps.

It was part of a heater hose kit designed to help reduce engine noise introduced into the cabin via the heater hoses. It was noted in the April 1964 Service Bulletin which would have put it well into the 1964 Production year and was only available on demand from the picky owners which they complained of engine noise as noted in the SS bulletin below:

That would make it a pretty rare feature/modification me thinks.

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