Aluminum Manifolds & corrosion/oxidation?

I have my car stored outside & it's covered & waterproof. I looked under the hood today and saw what looks like rust possibly forming on my air intake manifold, which is an "as cast" (not polished) Edelbrock aluminum...anyone ever have this happen? They are very small yellowish spots...almost looks like it's getting the measles. Will polishing solve this? I really wanted to keep it "rough" but now I'm concerned.

I think its oxidation. I have he same thing on my manifold. I'm thinking that I'll take it off, bead blast it, and then have it powdercoated clear. Then just be careful when tightening the bolts not to chip the powder coat.

maybe squirt some light oil (3 IN 1) on it then wash it off in the spring.

Ain't it a drag? Thx 4 the reply. I have some Por15 I'm gonna try that with an engine enamel topcoat, I think. I'm getting PO'd at my buddy who was going to dig his engine crane out for me...like before Thanksgiving. I gotta get that engine & trans in the workshop...Ugh.

I've bead blasted a couple, and used a satin clear coat on them. It's good for a few years.
I've had more problems with aluminum manifolds corroding under the water neck/thermostat housing than with the outside.