Looking around different parts catalogs, water pump would have had the straight pipe down. My book for As (not SAs) shows NO pipe, and a plug instead of a cap, that went directly into the drain hole in the bottom of the lower inlet. The catalogs are from different years, so maybe the pipe and cap replaced the plug on one or both at some point in time.
Again, if that's where you found the bolt that allowed it to drain, it kind of reinforces my suspicion that somebody might have wound/forced a straight-threaded bolt into a tapered pipe thread. A hint to that would be if your bolt was a hex head. Not true in every case at all, but MOST pipe plugs of that era had a square or recessed head. (The original in this case had the same Mickey Mouse ears that the pipe cap did.)
If that is the case, all is not lost -- the taper of the pipe thread might make for an easy fix. A 3/8" pipe plug is a common hardware item. get hold of one and see if it will thread back in. By the pipe thread being tapered, there's a good chance that a regular bolt would only have messed up the top or the bottom of the thread, with luck not the whole thing. In that case, a good new plug with sharp threads might just bite and do the job. Be sure to use some plain old pipe dope on it, and if it will thread in, it should hold, especially if your cooling sytem is of the non-pressurized type.
If it doesn't hold, you may have to remove the pump/inlet (two bolts) and put it on the bench to either clean up/restore the threads or drill out and rethread for a larger plug. (If there's enough thread left to get a 3/8" NPT tap started, you should be able to just restore the thread by cutting it in a little deeper -- IIRC cutting threads in cast is best done dry, i.e., without oil on the tap -- a better option in my book than enlarging to take a 1/2" plug. That and a gasket should take care of it.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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