The original valve covers were cadmium plated and many of them then had a clear lacquer coating that breaks up over time and goes a bit yellow. They also rust on the outside. Current finish is up to you. Wheel silver paint holds up well plus clear lacquer if you wish. Silver/blue zinc plate is good if the surface isn't damaged with rust. Engine including sump is red. Front timing cover can be silver too. It's an alloy casting so will get a bit scruffy over time.
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