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I had the same problem, went by the book on a rebuild, everything new but then found out after some miles about the "little things", like the fact that valve guides are supplied to shops already sized. What this means is that when they are pressed in by a shop, they bell up in the middle of the guide and have to be reamed to get the valve in (recall that the guides were already sized). So what you end up with is sloppy outer tolerances which eventually beat themselves out, sooner if not later, causing all kinds of problems.
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