Sign of wear, in other words visual wear, is not enough. That's why TOH said to measure. Typical oil clearances are for proper lubrication and heat transfer in the stem/guide area. Margins should be checked for thickness before and after grinding/machining the valves. Check the margins for thickness, typical stem wear limit is .001 from stock diameter. Main issue there is oil clearance though, and line up all the valves and check for necking or stretching of the valve which should not be common in this engine. Mushrooming of the tips is somewhat common in older engines and nothing a file can't clean up. Hope this helps. Gerard
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