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all my exhaust valve overall lengths are 4.265" to 4.268" so they are right in the middle of the tolerance range (4.258" to 4.278") so I think they are correct.
However, most of my valve heights are 1.781" to 1.789" which is under the low end of 1.799" or 1.800". With no shims, of course.
I think something must be wrong with that height spec, since a typical new valve won't meet it and I have not changed the seats. I don't think I should have to grind the valves to get there, do you? Wayne must have been aware of this when he put the footnote in the book, don't you think?
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