i can't be the first one to point this out, but if anodizing the head increases the thermal conductivity, why would you do it? people ceramic coat combustion chambers to REDUCE heat transfer dont they?
what you are getting at with the heat sinks is partially true, but think of it like this,
anodizing increases the surface area, which increases the emissivity (radiation heat transfer)
BUT it also reduces the thermal conductivity, so more of less of the heat is getting radiated, if you get my meaning.
excuse me if i missed the point, i skimmed most of this post.