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I believe that is an advertisement.
In model year 1966 Ford Motor Company painted all engines blue. Called Ford Corporate Blue. While the shade of blue changed, Ford continued to paint car and light truck engines blue until 1981. After that engines were painted gray. That is because grey engine paint cost less than blue engine paint.

Prior to 1966 engine blocks were painted black and valve covers and air cleaners were painted various colors based on displacement and/or use.

YEAR	ENGINE​	BLOCK AND CYLINDER HEADS​	AIR CLEANER​	VALVE COVERS​
1959	223	Black	Red	Red
1959	292	Black	Red	Red
1959	332	Black	Green	Green
1959	352	Black	Blue	* Blue
1960	223	Black	Red	Red
1960	292	Black	Red	Red
1960	352	Black	Blue	Blue
1960	352	HP Black	Gold open-element	Gold
1961	223	Black	Red	Red
1961	292	Black	Red	Red
1961	352	Black	Blue	Blue
1961	390	Black	Silver	Silver
1961	390 HP	Black	Gold	Gold
1961	390 HP-6V	Black	Oval aluminum	Gold
1962	223	Black	Red	Red
1962	292	Black	Red	Red
1962	352	Black	Blue	Blue
1962	390	Black	Silver	Silver
1962	406-4V	Black	Gold open-element	Gold
1962	406-6V	Black	Oval aluminum	Gold
1963	223	Black	Red	Red
1963	289	Black	White	White
1963	352	Black	Blue	Blue
1963	390	Black	Gold	Gold
1963	406-4V	Black	Gold open-element	Gold
1963	406-6V	Black	Oval aluminum	Gold
1963	427-4V	Black	Chrome open-element	Chrome "baldies"
1963	427-8V	Black	Oval aluminum	Chrome "baldies"
1964	223	Black	Red	Red
1964	289	Black	Red	Red
1964	352	Black	Blue	Blue
1964	390	Black	Gold	Gold
1964	427-4V	Black	Chrome open-element	Chrome "baldies"
1964	427-8V	Black	Oval aluminum	Chrome "baldies"
1965	240	Black	Red	Red
1965	289	Black	White	White
1965	352	Black	Gold	Gold
1965	390	Black	Gold	Gold
1965	427-8V	Black	Oval aluminum	Chrome "pentroof"
1965	427 SOHC-4V	Black	Chrome open-element	Cast aluminum

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