Re: Radiator Cap
GM & Ken/Alabama,
I just checked the radiator in my '39 coupe and found the following:
1. The upper tank has a raised code on the motor side/passenger side. It is "11A/G", that is an "11G" over a DASH over the letter "G". I don't know if this makes it a '39/'40 radiator or not.
2. I looked for the outlet on the upper tank as you described. There was none, nor could I find a soldered hole. However, it may have been obscured the the other soldering that had taken place.
3. There is an outlet/tube in the fill tube/neck, between the lower seat and the upper end of the neck. The hose from this tube goes to the bottom of what I believe to be a overflow tank (long, thin vertical cylinder). This looks exactly like what you guys are talking about above.
4. The distance between the lower seat and the top of the neck is 3/4".
I need to replace/repair my existing pressure (has spring) cap because the rubber on the bottom is cracked and the metal bushing on the top is spilt. How can I tell what pressure it is (no markings)? What is the difference between using the 4# and 7# cap? Where can I get one, still retaining the period look?
Thanks for alll your help.....Joe
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