Quote:
Originally Posted by russcc
Here is look at the underside of a trial manifold after cleaning with marine bottom cleaner, (acid base). Heavily coated with the cleaner, let it set a couple hrs, and washed it off with fresh water. Got rid of all the oil grime. Ready to use. Now for the flip side.
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Man, that seems to work pretty damn well. The good thing about cleaning it chemically is that it does NOT break the factory 'glaze' or patina that never survives after bead blasting. All I know is that if you find something that works, keep that recipe handy, and please let the rest of us know what it is. I tested some kind of dedicated aluminum cleaner on the bottom of a 'pricy' aluminum manifold years ago and almost had a heart attack when it left black spots on this old aluminum after only a short-duration application. Some of these older aluminum castings can have no-telling what kind of an aluminum composition. DD