The block may be the culprit, then. Those blocks have a big internal tank with an inlet and outlet. They aren't the most efficient buggers in the world. Do you have another block you can try? (Yes, the better lapped the better the connection ... just use next to no goop or you'll have WORSE connection ... you want to only see the sparkle on the metal if lapped perfectly).
As for the battery effect, I don't believe antifreeze will help. Water wetter might. I'm not to up to speed on that, though. Anybody else have any ideas?
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