When you do remove the block I would have a serious look at the block interface with the CPU die... if it was perfectly flat then ruinnning your fingers over it SHOULD detect any "inperfections".
I recon the block has been moulded slightly. Though this is just a hunch remembering that poeple used to warm the metal up in their hands before making jewelry from it and the blobk will get to a much higher temperature... and more importantly a higher preasure.
Speaking along those lines... with a softer metal the force of the water on those impingment cups could have worn them to a slighly more efficient shape. (A Teardrop sort of one? *shrugs*)
Anyway you look at it though a VERY close look at the entire block is worth it. If it seems identical then its the AC3 working extra well with a silver block than a copper.
~ Boli
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