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Tricky doing accurate measurements, but I did use a rule across the tops of the rockers and eyeballed the travel of each rocker at the spring side. It all looks good. Cranking the engine over for about 20 seconds didn't wet any of the plugs on the right bank (where #8 is) but wet a couple on the left bank. Maybe there's a vacuum leak at the inlet manifold to the head right at cylinder #8? Hard to verify without removing the inlet manifold replacing the gasket, etc. Being in Australia, it'd probably take a week or more to get another gasket from the US.
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