How do I safely remove the rest of the glue/gasket material from the lower intake without taking off too much material. Can I use 2000 grit sandpaper? I have used a razor blade along with some gasket remover but this is as clean as I can get it. Or is this corrosion on the aluminim as it only seems to be like this around the coolant ports?
View attachment 223932
View attachment 223932