This thread sure has covered a lot of ground for what looked like such a simple question. The B came with a non-pressure system. As CNKS said, inspecting the filler neck will verify whether it still takes an original cap. Having a water pump and whether it is a pressure system are really separate questions. A water pump attachment was available for the U-2 power unit from very early on. It was a bolt on that would fit any of the C-113 engines. The Farmall C's were all equiped with a pressure system, even though they didn't have a water pump. As Hugh said, the same pressure system was added to later Super A's. As far as I know, water pumps and pressure systems were used on all 123 engines. IH put a few big-bore engines in some C's for evaluation. I don't know if they had the water pump or not. 500 of these tractors were built. They were not built at the same time so they may not have even all been the same. The block change during Super A production was the larger lower bore for the C-123 engines, as Hugh described. It didn't have anything to do with the cooling system. Engines with water pumps used a head gasket with smaller holes in the water passage that did alter the water flow.
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