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0.11mm is super tight for an exhaust valve but that's not a destroyed head. That's just a really overdue valve adjustment so just get that done now. I don't see why you'd need to buy a new head. See the ideal valve clearance ranges on page 59 of the service manual.

Exhaust 0.17 ∼ 0.22 mm (0.0067 ∼ 0.0087 in.)
Intake 0.15 ∼ 0.22 mm (0.0059 ∼ 0.0087 in.)

I understand that tight valves get quieter, not louder. It just seems like you had a loose timing chain to me. Do you know for sure that the manual CCT was re-set properly and not just reinstalled too loose? I actually prefer the OEM self adjusting CCT for its diagnostic ability. Even if it does a crappy job at self-adjusting and doesn't tension properly, once the chain gets loud you just remove the CCT spring first and pull the ratchet out 2nd to preserve its setting. Then you see what tooth it's on, push it 1 additional tooth and re-install. Even 1 tooth seems to be enough to quiet down the chain.
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