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so I went and searched that and reading different things that stainless screws will corrode aluminum threads but steel screws are worse, zinc plated stainless is ideal I think...
I was a certified outboard mechanic in a former life. I've taken apart lots of aluminum engines where someone replaced an OEM stainless screw or bolt with a carbon steel one. It ain't pretty. There's a reason outboard manufacturers go to the extra expense of using nothing but stainless screws and bolts on aluminum engines.
Dissimilar metals, (nonferrous and ferrous) contact will cause (corrosive) electrolysis. There are many grades of stainless steel, the "lower" (although structurally stronger) grades will be magnetic because it's chemistry is still in the ferrous "range". Just make sure the stainless screws you use don't get picked up by a magnet and you'll be good to go using them on aluminum.