Here's another way to keep an aluminum manifold looking like new...at least it implies that. I copied this off of a post from over a year ago here on Fordbarn (I think). I haven't personally verified this but I'm inclined to give it a try.
"I just sent a 34 aluminum intake manifold to
www.jandpdeburring.com they use a vibratory process for cleaning then a media that contains aluminum to refinish and the results were outstanding it looks just like it came off the assembly line. This puts a skin on the surface of the part and it looks just like the original factory finish. It also seems to seal the part so that gas, oil and grease doesn't penetrate the aluminum. If I remember correctly the cost was around $25.
J & P Deburring Inc.
9135 Alabama Ave. Unit D
Chatsworth, Ca. 91311
(818) 998-6079
Last edited by Steve Staysko; 01-08-2011 at 11:54 AM."