Hi,
Those valve covers were something I did with a spray paint made by Dupli-color called Metalcast. It's kind of fake anodizing and looks pretty good. The valve covers actually look better in person then in the pic. It's made to be sprayed over chrome or polished aluminum to get that look. You use a adhesion promoter first. It takes some practice, and a steady hand when using a razorblade to get the paint off the tops of the letters and fins. Jim.

METALCAST™