I knew a marine mechanic that had aluminum heads on his blower engines. He said he used them for seven years, took them off, and resold them. 100% salt use. It's just how you maintain them. I think the whole aluminum/salt thing is blown way out of proportion. If you think about it, what is your outdrive made out of? I have aluminum intakes on my Formula, and I recently pulled the t stat housing to check for corrosion. Not a sign of it. They have been on for at least four years.