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The 1975-4 issue of the Pierce-Arrow Service Bulletin was devoted exclusively to paint colors and formulae. It has some information about engine colors. Among other things it says that some 1929-32 engine blocks were delivered with dark gray blocks, and some with dark green. I expect that Bill Scorah’s and Greg Hotson’s engines sport the original colors, as they suggest. I doubt is the blue block in the ad mentioned by Bill Rolapp was ever a production color.