Originally Posted by bartamos
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Bottom line: can't find factory literature or brochure stating colors of truck motor. Just articles.
Here is a 20+ year old article on Chevrolet car/truck engine colors.

But, as bartamos posted, no one knows the color codes, but I have a Chevrolet document stating the 1954 truck new (high pressure) 235 engine was painted gray (which shade .? .? .? - unknown).