Good interesting stuff b-man - keep it coming.
As to the cooling tubes - are you sure those are originals or someone's attempt at a repop? I thought I had heard before that the originals would rust out with time hence would not be stainless. I would have to recheck my old information regarding galvanic corrosion. If I remember correctly stainless in contact with steel would cause galvanic corrosion of the steel. So I would expect the factory originals to be steel and not stainless to prevent such corrosion. Maybe that is not true for cast iron in contact with stainless. But if yours are a homemade repop out of stainless maybe that would explain the poor fit and crushed area at the inlet end.
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