Good Ford engine color info here: http://www.mustangandfords.com/how-to/paint-body/mump-0308-select-correct-vintage-mustang-engine-paint/ "For many years prior to 1966, Ford engines were color-keyed to specific applications and carlines. For 1966, this practice changed, when all Ford engines were painted Ford Corporate Blue. Instead of color-keyed valve covers and air cleaners, the entire engine would be Ford Blue, like the Ford Blue Oval and the Ford Blue offset dealer signs popping up in 1966. Ford's message for 1966 and beyond was simple-if it is blue, it is power by Ford."