273 dilemma

Dana67Dart said

My bet is it was rebuilt as it's not red

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While I agree with the logic, I can't be certain either way. There are NO indications of any red paint anywhere on the motor (other than the 4bbl intake I set on top). If it was a rebuild, they stripped the oil pan and valve covers as well, and there is no indications of any blue or red overspray.

Maybe a marine or industrial engine???

I once had a 64 4-door d100 truck that was labeled as a Navy vehicle. the truck and motor were painted gray.