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Thanks, Steve! I'll try to find something close to that color. I see also that the push rods are chrome instead of black as well. Guess I'll be repainting those. Everything I had found said that they were black.
Here are some pics of the R-2800-57 C-series engine that was on the P-47M and P-47N. A much different look than the earlier R-2800s on all the other mods of the P-47.