(quoted from post at 06:22:59 03/28/11) I've got a new rad cap for our recently acquired C from the CIH dealer. It is a thermo-syphon system. I asked for a non-pressurized cap, but the one I got has 7 lbs stamped on it. It does fit. Searching through the pages, I understand that a non-pressure rad is of different construction than a pressurized system rad and can't withstand pressure. I also understand that if it's non-pressure, the gas cap will fit and hold on it because it will have internal tab locks on it unlike the pressure ones which are external tab as most rads are these days. The rad looks very good, so I'm sure it's not original.

My question is, can this thermo-syphon system run pressurized and/or is there a new style cap that vents and doesn't cause pressure build up, and lastly, if the system is pressurized, how much should it run and where to get the cap? I've seen different cap pressures mentioned in the posts. This site won't ship to Canada, and while most things are available through the CIH dealer, there are no longer any old time IH parts guys there that would probably know the definitive answers. MK

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(quoted from post at 07:53:28 03/28/11) Rusty, Do you mean fits, as in the size/diameter of the neck, or also the diameter and internal locking tang? I will have to check later today when I drive up to the shop. Markus

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