Sleeves in the LS block are still cast iron. Ive never built an LS but I would think they protrude into the wet part of the block. Not to mention, the multitude of engines out there with iron blocks and aluminum heads from the factory.
Electrolysis is the result of dissimilar metals causing acidity in a solution (same way a battery works). In that respect, whether you chose to install an aluminum radiator (on any engine, because they all have iron somewhere) the choice is no different than installing aluminum heads or an aluminum water pump. Aluminum in the cooling system is still aluminum, no matter the function.
The thing in my cooling system is called a sacrificial anode.
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I <3 forced induction.
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