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Interesting. The old cap is a 7 psi type, with a dimension of 7/8" from the rubber gasket under the top to the bottom of the seal.
Did you read my last post?? 7/8" is not enough. No wonder you loose water. You might as well leave the cap off. I just measured the drop on my radiator and it is 1". You need to find the correct cap. Your cap is 1/8" short. No Seal. I told you My car had the same problem when I got it (WRONG CAP).
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I think I would like to try the 13 lb version.
I would not. The system was designed for a 7 lb. cap and that's what should be on there. Increasing the pressure will only increase the possibility of blowing something out.
Again, Just try the correct cap. 7 lb. with a 1 inch drop.
The The parts dealer here where I bought my cap did not have the cap listed for Packard per say. He just went through his books and found a 7 lb. cap with the proper drop. Wish I could remember the number on it. I would give it to you.
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