feh, I checked my valves at 36k. None were out of adjustment, although several were at the tight end of the spec.
I set all valves to the loose end. I'll check them again at around 65k...if they haven't moved....then I'll never check them again.
My experience tells me that on most OEM engines, after the initial valve adsjustment, most Japanese engines tend to keep the same clearance.
YMMV.
