Engine block color
As it came from the factory, there was no paint

. Block, head, cam cover, front cover, pan, all bare aluminum

. The pressure casting technique and alloy causes the cam cover to be slightly darker, as is the front cover.
Now Ferrari, on the other hand, painted blocks (early on) a silver that is duplicated by Harley Davidson case paint silver, and cam covers were first a darker silver and later wrinkle black. (In most cases.) Good enough answer

?
(Ausca Alfa engines had heads painted (early) Ford red, and later crinkle red, with matching front covers, and wrinkle black cam covers.)
[NO CHEVY ORANGE

]

Gordon Raymond