Correct A/C Manifold Port Caps - NCRS Discussion Boards

Correct A/C Manifold Port Caps

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  • Christopher K.
    Very Frequent User
    • September 10, 2007
    • 311

    Correct A/C Manifold Port Caps

    Can anyone tell me which cap is correct for the air conditioning manifold connections on my 1972?
    The larger one is a repro and the smaller is an old original from an unspecified vehicle.

    Thanks for the help,
    Attached Files
    Chris

    '72 Lt-1 a/c Pewter Silver coupe Mason Dixon Chapter Top Flight 2016
    '73 L82 4 spd Dark Metallic Blue coupe Chapter Top Flight 2023
  • Bob D.
    NCRS Shipping Data Report Manager
    • April 30, 1996
    • 787

    #2
    Re: Correct A/C Manifold Port Caps

    Chris

    The smaller of the two caps appears to be the correct manifold cap. It is very similar to those on my '71 which has the orignal caps on it.

    Bob

    Comment

    • William C.
      NCRS Past President
      • May 31, 1975
      • 6037

      #3
      Re: Correct A/C Manifold Port Caps

      As I recall, my '72 had the round head rather than the flat head, easy to pick out, but been a few years, I was second owner of low mileage car.
      Last edited by William C.; April 6, 2013, 07:10 PM. Reason: enhance
      Bill Clupper #618

      Comment

      • Terry M.
        Beyond Control Poster
        • September 30, 1980
        • 15583

        #4
        Re: Correct A/C Manifold Port Caps

        If I had a `968 to 1972 Corvette with C60 I would like the one in the last picture.
        Terry

        Comment

        • Dick W.
          Former NCRS Director Region IV
          • June 30, 1985
          • 10483

          #5
          Re: Correct A/C Manifold Port Caps

          Picture #4. Cadmium plated
          Dick Whittington

          Comment

          • Christopher K.
            Very Frequent User
            • September 10, 2007
            • 311

            #6
            Re: Correct A/C Manifold Port Caps

            Thanks very much everyone, I appreciate the comments.
            Chris

            '72 Lt-1 a/c Pewter Silver coupe Mason Dixon Chapter Top Flight 2016
            '73 L82 4 spd Dark Metallic Blue coupe Chapter Top Flight 2023

            Comment

            • Terry M.
              Beyond Control Poster
              • September 30, 1980
              • 15583

              #7
              Re: Correct A/C Manifold Port Caps

              Originally posted by Dick Whittington (8804)
              Picture #4. Cadmium plated
              I would argue it should be tin, but without a metallurgical test we will never know.
              Terry

              Comment

              • Dick W.
                Former NCRS Director Region IV
                • June 30, 1985
                • 10483

                #8
                Re: Correct A/C Manifold Port Caps

                Originally posted by Terry McManmon (3966)
                I would argue it should be tin, but without a metallurgical test we will never know.
                Picky, picky, picky Ever which one was cheaper I am sure.
                Dick Whittington

                Comment

                • Terry M.
                  Beyond Control Poster
                  • September 30, 1980
                  • 15583

                  #9
                  Re: Correct A/C Manifold Port Caps

                  Originally posted by Dick Whittington (8804)
                  Picky, picky, picky Ever which one was cheaper I am sure.
                  Amen brother!
                  Terry

                  Comment

                  • Kurt G.
                    Very Frequent User
                    • April 30, 2005
                    • 343

                    #10
                    Re: Correct A/C Manifold Port Caps

                    My early '72 has a rounded top, cad plated cap.
                    Kurt Geis
                    Chairman, Midway USA Chapter
                    Targa Blue 1972, Top Flight and Duntov Award, 2014
                    Arctic White 1994, Top Flight, Hrt. of Amer. Reg. 2011
                    Arctic White 2013 60th Anniv Special Edition Conv.

                    Comment

                    • Wayne M.
                      Expired
                      • February 29, 1980
                      • 6414

                      #11
                      Re: Correct A/C Manifold Port Caps

                      Originally posted by Dick Whittington (8804)
                      Picture #4. Cadmium plated
                      Agree, Dick -- without chem analysis . This might have been discussed in years past.

                      Here's a service AC manifold / muffler I have -- believe it is the 1968 part # as that was all that was available from the General in the early '90s. It's NOS, in the sense that it's been installed (for appearance) on a compressor, but never seen Freon .

                      The plating is (now) even darker than I remember a decade ago. I get the impression you could rub it off entirely with little effort.

                      Close-up is of what I think is a Weatherhead stamping (going by the hex and the feather tail of an arrow) -- any thoughts ?

                      Also I can now make out the hex stamping with the 'W' in a vertical row on the face of the cap in the middle of the first pic.
                      Attached Files

                      Comment

                      • William C.
                        NCRS Past President
                        • May 31, 1975
                        • 6037

                        #12
                        Re: Correct A/C Manifold Port Caps

                        Mine was a late car, same result, domed top probably cad in that era, conversion away from cad started about '74 in GM as I reacll. We spent a TON converting plating lines, installing new lines etc.
                        Bill Clupper #618

                        Comment

                        • Dick W.
                          Former NCRS Director Region IV
                          • June 30, 1985
                          • 10483

                          #13
                          Re: Correct A/C Manifold Port Caps

                          Originally posted by Wayne Midkiff (3437)
                          Agree, Dick -- without chem analysis . This might have been discussed in years past.

                          Here's a service AC manifold / muffler I have -- believe it is the 1968 part # as that was all that was available from the General in the early '90s. It's NOS, in the sense that it's been installed (for appearance) on a compressor, but never seen Freon .

                          The plating is (now) even darker than I remember a decade ago. I get the impression you could rub it off entirely with little effort.

                          Close-up is of what I think is a Weatherhead stamping (going by the hex and the feather tail of an arrow) -- any thoughts ?

                          Also I can now make out the hex stamping with the 'W' in a vertical row on the face of the cap in the middle of the first pic.
                          I believe Weatherhead was the OEM supplier. When I first started in the restoration business, I was able to purchase brass caps from Weatherhead. If only I had known, I would have purchased 1,000 while they were still available. You know, the old woulda, coulda, shoulda routine
                          Dick Whittington

                          Comment

                          • Christopher K.
                            Very Frequent User
                            • September 10, 2007
                            • 311

                            #14
                            Re: Correct A/C Manifold Port Caps

                            Great pics Wayne, thanks!
                            Chris

                            '72 Lt-1 a/c Pewter Silver coupe Mason Dixon Chapter Top Flight 2016
                            '73 L82 4 spd Dark Metallic Blue coupe Chapter Top Flight 2023

                            Comment

                            • Peter L.
                              Extremely Frequent Poster
                              • May 31, 1983
                              • 1930

                              #15
                              Re: Correct A/C Manifold Port Caps

                              Wayne - I've found the hex-nut Schrader valve caps with the WeatherHead logo, and both of the configurations of the caps that started out this thread on various Chev & other GM
                              AC manifolds on A6 Frigidaire compressors. Personally, I think you can "pick your poison" when it comes to which one was the cap "du jour" for that day, production run, or year; but trying to figure out what was used after 40-50 years is what make this hobby fun. Pete

                              Comment

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