One more point on the MM repair kit. This item actually replaces the original threads in the casting with a "thru bolted" unit. It is threads that are most vulnerable to galvanic "assault". Once installed the repair kit sets up along its entire length against the casting thus spreading the connection against a much more substantial metal surface. In an antifreeze environment, other things being normal, I might start looking for trouble from this installation after around 50 years.
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