[russcc]

Latest update. If you decide to use Marine Grade Hull cleaner to clean an old aluminum manifold, look out ! In the 2nd experiment I cleaned the oil sludge off the bottom of another manifold. This product, StarBrite foamed, steamed, and heated up the metal and generated some nasty acidic fumes. I didn't harm the aluminum, but it was kinda scary. Use the stuff with care or have someone do it for you. Do it outside, in a good breeze, (ventilation), away from the garage and house, use a catch pan under the item, and a garden hose to wash stuff down with. I touched it up with the wire wheel, and hit a couple hard to get at grime pockets with the bead blaster, and here is what it looks like. I had a good size tapered reamer I cleaned out the heat riser tubes under the carb.with
This is just a manifold to use on my test stand so I don't have to handle the heavy cast iron type, so it will never see the light of day.