If you’re not good at telling one brand’s engine from another, perhaps the color may help. In the case of Ford Motor Company products of a particular era, they were painted a certain shade of blue starting in the 1966 model year.
As part of a branding effort, Ford wanted you to know that the sign of quality under the hood was painted the same hue as the Blue Oval logo that was so familiar to many people since 1927. Of course, Ford’s marketing department didn’t tell you this streamlined the production process as well.
From what I can gather, the use of “Ford Corporate Blue” engine paint did not last beyond 1981, around the time when several platforms were modernized.
I’ve seen the above notice sporadically appear online over the years. I do not know if it came from Ford, but it certainly reads like it did.