You were asking about the backside on my black car and the water tubes. I have a ton of space back there as shown in the photo. The radiator has brackets welded on it to allow it to lay forward (sorry for the dust - proves I actually drive em haha). As far as brass vs aluminum, maybe you had a bad experience with the aluminum but I have the fluidine in my red 5S and a Ron Davis in my Group 4 for years with no issues (although I don’t do a lot of miles, but do drive in the excessive slow traffic Southern CA heat).
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