I have a '39 Ford 1/2 ton pickup with a '46 flathead engine. I have just rebuilt the engine and was cleaning the oil pan for re-installation. This oil pan has a short internally threaded tube (about 3/4") sticking out on the left side forward of the dipstick tube. When I disassembled the engine, there was a bolt threaded into the tube. After cleaning the dirt from the tube, I could see a passageway going down and coming out the bottom of a nickel sized flange inside the oil pan. This all appears to be factory and not something someone added on. The passageway looks too small (probably about .060) to be a return line from an oil filter. Can anyone tell me what this might be?
Being those engines used a bypass type filter a .060 restriction would be correct. All though it was most likely field installed unless factory ordered with a OF.
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