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werowance: I wouldn't look at water pump unless I were having circulation problems. My Super A has seen a lot of hours, sure you here them gurgling and bubbling after you shut them off, but they have been doing that for 50 to 60 years with no adverse effect. Thermosyphon was and still is a good cooling system. Now there are a couple of exceptions, plugged water jacket, a radiator that is partially plugged, but those will still give problems with a water pump. If part of the water jacket is plugged off and no water goes there, even pumped water takes the easy route. If part of the radiator cores are plugged off neither systen will cool right. There is also another exception, at least one guy here on YT had his radiator recored and the supplier could not get a proper core for thermosyphon, just maybe they are no longer available. He did have to add a pump. Adding the pump is no problem, just a straight forward bolt on. Problem comes at top finding a thermostat to fit and work properly. It can be done, and there are folks on here who have done it. I think geneb has.
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