Just fix the clearance with new shims and not worry about what the mechanic says. I just did my valve clearances last week. I had 18 of them totally out of whack. Easily fixed by following the toyota method in the service manual. Made a huge difference in how my supra ran. Nice and quiet now and running well. Some of mine had no clearance some were over a mm to much. your mechanic probably just doesnt want to bother with doing the calculations and such and order the new shims. A little time consuming but neccesary.
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