Tight exhaust valves and loose intake valves?

[bipolardave]

I recently adjusted my valves. Over the last 12,000 miles, my exhaust valves tightened to the point that they had almost no clearance (spec is .30 mm) and the intakes were loose at ~.20mm (spec is .10mm).

Unless I'm mistaken, valves tend to work tighter over time and not loose.

My hunch is that the mechanic who adjusted them previously confused the valves and adjusted the intakes to .3mm and the exhaust to .1mm. Each valve then tightened up .1mm since the last adjustment.

Thoughts?