67' 390hp master cylinder cap plating

[Dave K.]

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.]

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.

[Joe L.]

Re: 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.

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.

[Enzo C.]

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

[Steve B.]

Re: 67' 390hp master cylinder cap plating

Enzo, who plated your cap?

[Enzo C.]

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 ?