67' 390hp master cylinder cap plating - NCRS Discussion Boards

67' 390hp master cylinder cap plating

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  • Dave K.
    Very Frequent User
    • January 24, 2013
    • 278

    67' 390hp master cylinder cap plating

    Is the master cylinder cap suppose to be yellow(or golden hue) cadmium dichromate or cadmium/zinc? The 67' tech manual and judging guide pg 163 says "The fill cap is stamped steel cadmium dichromate plated with two domes." ???? To me this means it is the std. cadmium dichromate; however, when i see lots of vettes most of them have the yellow/golden hue which technically is the yellow cadmium dichromate. Can someone please clarify this for me.
  • Gene M.
    Extremely Frequent Poster
    • April 1, 1985
    • 4232

    #2
    Re: 67' 390hp master cylinder cap plating

    Dave,
    Master cylinder cap is plated yellow zinc dichromate. First plated zinc then dip in a secondary dichromate dye.

    Comment

    • Joe L.
      Beyond Control Poster
      • February 1, 1988
      • 43221

      #3
      Re: 67' 390hp master cylinder cap plating

      Originally posted by Dave Kocer (57952)
      Is the master cylinder cap suppose to be yellow(or golden hue) cadmium dichromate or cadmium/zinc? The 67' tech manual and judging guide pg 163 says "The fill cap is stamped steel cadmium dichromate plated with two domes." ???? To me this means it is the std. cadmium dichromate; however, when i see lots of vettes most of them have the yellow/golden hue which technically is the yellow cadmium dichromate. Can someone please clarify this for me.

      Dave------


      One more thing: the plated finish appearance of the original caps differs quite a bit from most reproductions, GM later replacements, and original caps re-plated in modern times.

      The original finish had a deep, rather dark "goldish" color and was absolutely NO GLOSS. There was no trace of "rainbow" hues often seen in these caps nowadays.
      In Appreciation of John Hinckley

      Comment

      • Enzo C.
        Very Frequent User
        • January 12, 2012
        • 534

        #4
        Re: 67' 390hp master cylinder cap plating

        Dave here is a pic of my fill cap as it was intended to be ... Looks like original image.jpg
        Enzo Colosimo
        Ncrs Ontario Chapter Chairman 🇨🇦
        ENZ-Z06/67

        Comment

        • Steve B.
          Extremely Frequent Poster
          • March 1, 2002
          • 1190

          #5
          Re: 67' 390hp master cylinder cap plating

          Enzo, who plated your cap?

          Comment

          • Enzo C.
            Very Frequent User
            • January 12, 2012
            • 534

            #6
            Re: 67' 390hp master cylinder cap plating

            Steve I got it from Ara the god father of Corvette parts... Maybe he will see this request ?
            Enzo Colosimo
            Ncrs Ontario Chapter Chairman 🇨🇦
            ENZ-Z06/67

            Comment

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