Chris, I'm going to take a stab it this. I do not know the answer, but I have a theory.
First of all, there are no two metals made that always get along with each other. however, some react worse than others. Now, considering how much iron and steel surround aluminum components on engines every day, i would tend to think that they are a pair that are considered friendly. Logically speaking, a head gasket and it's mating surfaces have to have a little give, and a lot of rigidity. If the steel ring was for the iron heads, doesn't that sound like a combination that would cause damage? I could be very wrong, but it seems to me that a steel ring and an aluminum head make sense. just like a brass ring and an iron head. One has to give a little, and one needs to remain firm.
Okay, now what I do know. Steel and aluminum will get along fine as long as they remain dry. Iron blocks and aluminum heads cause problems with cooling systems. The electrolysis that results is electricity created by the two metals and the water. So, if the rings were frequently wet, then I would think they would cause damage. But, if they get wet, you have a much more serious problem to worry about!
I think you'll be fine.
Take care,
-Chris
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