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Troll said: Hey I saw that happen.And there was a telltale sign it was going on.In my case it was the rocker arm hitting the retainer before the stem.
Hey Troll - That's exactly the problem that started me off on the measuring valve tip and retainer heights. I had pulled the valve covers about 6 weeks ago to adjust lash, and decided to look at the rockers. Four of the 16 were hitting the retainer. At that time, it appeared to be a problem with valve geometry, so my engine builder provided new rockers and longer pushrods. I also talked to AFR (they supplied the heads complete with valves), and they thought everything was ok, but suggested remeasuring the tips and retainers after a few hundred miles. So two days ago, which was 300 miles later, I remeasured, and found that all but one valve tip was lower than in the first measurements. Actually, I believe a more correct description is that the keepers and retainers are sliding up the valve stems, rather than the valves getting lower. Anyhow, I'm glad I found it now, rather than after blowing the engine.
Jerry C. - My retainers are supposed to be chrome moly steel. I'll find out what they really are in a few days.
Jerry
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