Dang how did I miss this?
Page 48.
Valve Train: Stock valve cover only with any stock configuaration gasket, sealer allowed.
Hal as that rule is written it doesn't specify that any changes to the stock cover are allowed. Including painting.
Clearly not any type of performance gain. However, it is still up to the individual to correspond with the tech official they will be dealing with.
I personally wouldn't DQ an iindividual for it.
UNLESS (And you know there had to be LOL) it was painted and polished and extremely brilliant chrome color and had a light affixed to it so that it reflected the beam of that light in a direction that could be determined was meant to shine upon the eyes of any competitor who may be behind them; causing temporary blindness to said competitor. Now that would be a clear Spirit and Intent violation. LOL
Of course that was not intended to be an actual scenario and was meant to add a lilttle humor to and otherwise dreary subject matter.