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