When I was doing the Engine in the Gold Nova, I tried a lot of different things to get the Aluminum Heads and Intake manifold to get that Factory look.....I ended up using Eagle One Etching Mag cleaner........Sprayed it on and let it soak for about 30 seconds then rinsed with water, I had to do it a couple of times to get the finish uniform, but it worked pretty good....Hope that "Helps"
Ken
