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By Cathar: This has been discussed before. BillA's test of the PolarFlo was with the initial versions with the rather "casually" lapped bases which weren't that flat, as was noted in Bill's review of the block. Joe tested the PolarFlo with the new "superfinish". The difference between the two blocks in terms of the lapping would easily explain a ~2C difference.
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Thanks, I must have missed that disscusion. It's interesting that lapping made such a large difference (more like ~3C). Think I need to go buy some sandpaper.
Edit: I just reread BillA's test and it seems to contradict what you just said. Do you have a link to where it was discussed that the block wasn't that flat?