The clearance on my Cosworth Vega grows .002" between cold and operating temperature, and I've measured the ramp tops at .016" above the base circle, so a the OE specified clearance from GM of .014" is right on, and the valves are probably a little quieter when cold, but it's tough to tell because the loose clearance forged pistons create a cacophony until the engine heats up, and even when warm the engine still generates a lot of mechanical noise.

Normal mileage accumulation sinks the valves and since changing shims is such a POA on the 16V (the CV has shim over bucket design) I would recommend you set them at the high end of the range and then reset if they fall below the low end, but that should be many tens of thousands of miles.

Most modern DOHC designs with lash should hold their settings very well due to high quality valve and seat materials that erode very slowly.

Duke