Looks like the answer is .022 but you'll find greater differences than .002 if you don't set the clearance at exactly 180 camshaft degrees from open.
In other words, check your valve clearances at other than one place in your engine rotation. Most folks believe that the clearance should be set at the 180 degree point from the wide open part of the camshaft. When I tried it there, I found another .010 of clearance when the flywheel rolled on further just a bit. So was I setting it to .030 or .020 by the book? I'm not sure, but I didn't like the valve clatter and set it tighter which got rid of the noise.
Another fellow chimed in once and said "me too on mine", I suspect that they are all this way, but not enough people care to shave these thousandths often enough to make it an issue or common aspect of valve setting, at least so far.