[KQ400Pilot]

The old adage is "Noisy valves are happy valves"--meaning that if you can hear them clicking, they have adequate clearance. Noisy valves will give you more power (to a point) and won't damage the engine.

Quiet valves, on the other hand, mean that there is little, or no clearance. The engine will be difficult to start, and can be damaged by the low/no clearance.

Dealers have a tendency to set the valves a little tight, so that customers did not return complaining that there is something wrong with the engine--as "it is making a clicking noise".

For once, the dealer is telling the truth when they say "it's supposed to do that" and "it's good for the engine". Unfortunately, dealers have lied to the public so much that it is hard to believe anything they say, and the public remains suspicious--which we should be.