Painting engine head?

[Tommd55 (Tom D)]

Here is some discussion on XK cylinder head colors, including a chart.

Colour code for XK cylinder head

That’s interesting. It seems to be generally accepted (@DrewSchertz makes reference to it above) that Jaguar ceased painting the cylinder heads of cars destined for the US at some point in 1966, some time before there was any US-specific emission requirements. It would seem strange for the factory to paint heads differently for different markets if there was no other reason to differentiate them.

Tom