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The for sure survivors I've looked at have had the master cylinder painted. According to the latest new addition NCRS 68/69judging manual it states the following: "The master cylinder was painted a low-gloss or foundry black. A semi-circular machined area at the front of the casting was machined after painting and so should be natural finish. The flat at the front has PG stamped in it for power brake units and DC for manual brake units." And "The boss that the brake lines thread into is machined flat after painting and will be natural finish." JohnZ has stated “I was there in the assembly plants in the 60's, and Delco-Moraine painted the master cylinders and brake calipers black prior to machining; I never saw one unpainted.” I purchased a late May69 power booster/master cylinder from Jere Stahl that had been given to him from Delco Moraine Engineering. On the production parts list sheet it calls for it to be painted black (see item 24).
Chris I think Chick's reference may be to Corvettes, as the quotation is from the NCRS Judging Manual.
That book sounds like it may be a good read. Is that NCRS judging manual in a PDF form we can download for free or do the NCRS Corvette guys charge $100 for it?
Kinda funny how things escalate incorrectly. How many times have you seen chalk marks and such that are totally bogus and incorrect? My theory is someone had a car at a show that had a nice presentation albeit technically "wrong". Then, onlookers gawk at the car, go home and make/change their car to appear like the one at the previous show....and then another group sees THAT car at cruise night and the snowball effect gets started. Who was the first person to INCORRECTLY install the dreaded FORD fan sticker on a CHEVY fan shroud? See what I am getting at here??
This photo, from the Chevrolet Quality Brake Service pamphlet dated July 1968, confirms what was said previously, that the master cylinder was painted black and prior to machining.