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Old 03-16-2020, 06:57 PM
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Not painting the master cylinder semi-gloss black on GM cars
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Old 03-16-2020, 07:42 PM
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Not painting the master cylinder semi-gloss black on GM cars
It is considered correct either "cast" color or black as some say they came bare.
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Old 03-16-2020, 07:53 PM
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It is considered correct either "cast" color or black as some say they came bare.
According to Delco Moraine paperwork, part of the assembly procedure for master cylinders is to paint them semi-gloss black. I think it's either the 7th step or the 17th step (can't remember) in the assembly. I once posted the sheet which showed it. It's over somewhere in my You Can't Make This Stuff Up! thread. Probably within the first 100 pages. It's orangish yellow so if you want to find it you can scan quickly. I believe (?) it started with the 1967 models when they changed to the dual master cylinder.
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Old 03-16-2020, 08:51 PM
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Regardless where or when assembled,1970 Chevelles with incorrect 1969 master cylinders.

hence...

[QUOTE=Lee Stewart;1488881]
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Old 03-16-2020, 08:55 PM
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All GM master cylinders were painted black, they were not bare metal. That's a common restoration mistake.
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Old 03-17-2020, 02:17 PM
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Not painting the master cylinder semi-gloss black on GM cars
I have been documenting 1970 Chevelles for 40 years (mostly the LS6) and have found numerous survivors with no evidence of paint what so ever. That being said I have found numerous survivors that DID have semi gloss black on them. Same goes for the calipers. I typically restore all of our cars (assuming they were survivors when we received them) as I find them. If I find no evidence of paint then that is how I restore them. However, I do not paint them cast iron either.

My thoughts have always been that many likely started out with enough paint on them to keep them from flash rusting during the shipping and assembly period and them not worrying about them rusting once they were delivered to the dealer. Therefor, just enough paint to satisfy the manufacturer.

I also treat them somewhat the same as exhaust manifolds. Most of us know that they were painted on the engine on a big block but most of the orange burned off shortly after starting them so many of us who chose to paint the orange on them paint them in a way to simulate the after effects of them when it has burned off. Could these master cylinders not be restored the same way? To replicate what they looked like by the time they arrive at the dealer? I now restore mine with just a misting of black paint on them to simulate what they may have looked like during the assembly line process.

It also could boil down to a plant destination thing. It is a well known fact that many Chevelles had NO paint on any of the rear suspension and transmission crossmember (I mostly see that on Baltimore cars) whereas the other plants painted them overall black so I guess it is another one of those "never say never" things.
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