Quote:
Originally Posted by PAUL K
It's rust. The heads are blasted with metal during the manufacturing process. Sometimes specs of metal are embedded in the aluminum and then rusts.
|
Paul is right, it is embedded rust. Had the same thing happen on my rpm intake and it keep getting worst as time went on. Never could find anything that would clean it up, so i just used high temp aluminum engine paint and sprayed entire intake. It turned out great, looks new again.