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I had a core with an extra row of tubes made for a '54 UTS that had a 403 engine in it. There was room in the tanks at the back, in front of and clearing the fan. Some things you might want to check: Fan shroud-Sometimes if the fan shaft nut works loose, it'll drop down and wipe out the lower half of the shroud. Your shroud should be pretty much a box with a round hole for the fan to turn in so all the air the fan churns has to go through the radiator. I'm guessing you have replaced the thermostat, or removed it entirely. If you replaced the thermostat, did you drill a small hole (1/8") in the new thermostat so that a little water bypasses it at all times? If you don't the water in the engine will boil before the thermostat even thinks of opening. Have you checked the blocks for scale accumulation in the water passages? scale will retard the movement of cooling water in the blocks. I guess scale could also plug up the water manifolds. I don't think it could be a problem with the water pump, but. . . . If all these ideas are o.k.-take your radiator to a good radiator shop and ask the operator's opinion. It might just need a good cleaning. The last recore I got was just over $400 and it was for a stock core on a '49 UTS.
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