Honestly, I dont have an answer for you... But in my experience and from what I know about it.... You only have electrolosys issues when there are dissimilar metals in the cooling system.. Meaning cast iron block w/ Aluminum heads (or heater core in my experience).... The coolant flow across the dissimilar metals actually creates a voltage.. This volltage wants out... It will find a path, hence the holes in components.. Others may have better explanations and stories for you, but since no one posted yet I thought I'd just tell you my take on it and recomend a general web search for cooling system electrolosys...