The valve seats pound into the aluminium head. The lash closes. It NEVER EVER (if you do it right) increases.
That would be correct in your example, Merc. The "extra" clearance is to remove the ring of carbon on the valve face which impedes sealing. It is also why I recommend a recheck after 500 miles. A lot of people can bring a bike back from the dead. Mine's running good 15 years later.
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