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Dissimilar metals for the most part have a
reaction. Some are just more notable than others. I didn't think
Stainless steel had much reaction with aluminum, although regular carbon steels
sure do. Usually stainless is pretty benign and unreactive. Pot
metal doesn't seem to react much with regular steel, as evidenced by the
fact that you can get your fasteners out of there, usually, and
you rarely find problems on the body panels where it is mounted. Pot metal
does suffer from weather and salt.
I think you are pretty
safe using stainless fastners with aluminum, but you must be certain that the
gasket between the aluminum and the steel parts like fenders and headlight
pots is properly positioned and in good shape.
John
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