Valve clearance maintenance

[Raygen]

Hello Experts no doubt this maintenance procedure has been done by many. Our 2012 CRV is around 155K I just had this done, but am concerned; the pitch from the K engine has noticeably changed (higher) better 1/2 says it's a bit faster and I agree know this is maintenance (first time been done) but wasn't expecting to hear a different sound from k eng has anyone noticed this? abnormal? is this worrysome?

Thanks to the participants.
R,
Ray.

 

[Northwest USA]

Valve clearance? What maintenance is that? Do you need a new timing chain?
Why would it sound faster, the gearing has not changed.