Dougs w/ cam break-in?

They say not to because they may be discoloured, but that the coating will not be compromised.

I bought a set of dougs uncoated for mine, I painted them myself, and broke in the cam with them, the coating looks like it did when new, and still does, Im sure the actual dougs coating will fair much better, but of course the best choice would be to use a set cheap headers or manifolds for break in.