Re: Radiator Cap
The "correct" radiator for 39-40 will be stamped 91A and the filler cap will be located on the top drivers side corner of the radiator. It sounds like your radiator is set up to run a pressure cap. A 4 or 7# cap will work fine , should be able to get one from Napa or Carquest. I think the last one I bought was from Carquest . The 11A is a designation for 41 .
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