Quote:
Originally Posted by Formulajones
Exactly right!!
My sons air cooled bug is the same way. I lash the valves at .006", I can go as much as .004". I check it once a year. What I've seen if anything, is they tend to tighten up over time a thou or two. They never open up. So valve seat wear is usually the culprit.
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Yep, that would be standard behavior, specially on a head that has had valve work. After a while you can even see the difference in behavior for different valve alloys, seat materials and type of valve job. In fact I'd be worried if new valves or valve job DIDN'T close up a few thous
Solids are super helpful when racing as you rebuild the top end every year or two and compare one seasons lash readings against others. Seeing what changes in materials, valve brands, seat angles, cam lobe treatments, cam profiles, spring pressures and even fuel types have on the valve clearance. In short order you can determine where the problem is and correct it.