Smog Tube Coloring

[rpoz11]

Are you doing a particular restoration?

IE: Small Block or Big Block?

Year and Model?

[m22mike]

Chuck
I had a set plated black zinc last winter and they have been on my Camaro since then. I had de vaned the A.I.R pump and blocked the tubes.
They look OK but are not correct. If one was concerned about that...and I am not..
I may take some original's to my plater to look at sometime.
As mentioned already, they may have been clear cad/zinc plated and died. My plater showed me some bolts done that way and dyed OD green.
NOS and original tubes are all over the place with color from very bronze to several shades of green of green-brown.

[rpoz11]

I have seen both the Silver finish and the Black finish.

I have an NOS tube or 2 here in boxes and those are both Black Painted.

Ill have to dig out both BB 69 sets I have to compare with.

[69 L88]

The original BB smog tubes are brownish in color,
SB tubes are black

[Keith Tedford]

I have a new manifold that I bought from GM many years ago. It is the dark olive green that was mentioned here previously but could be mistaken for black under some lighting conditions. It seems to be see through and in the sunlight there are little prisms of colour here and there. The whole piece appears to have been coated or plated after it was assembled. This is not necessarily the way the factory did the assembly line stuff, it is just what I have.