I adjusted the valves on that engine for the former owner sometime last summer. They were not very far out of adjustment to begin with.

That being said, yes, the M110 will be noisy at idle because it's a high RPM engine. Most engines don't cruise at 4000 RPM + like the M110, so naturally the valves need plenty of clearance at lower RPM to allow for valve-stem stretch at high speed. As long as they are not noisy at the higher RPM speeds, you're OK. And as previously mentioned, even if they are out of adjustment, better to be on the noisy side than the quiet burn-the-valve side.

I suspect you took the car to a mechanic, the car sat for an hour or so, and the valves were then adjusted. Did he use hot or cold clearance specs? The only way to accurately adjust engine valves is to allow the engine to sit over night to completely cool (M110 valves are at the very top of the engine and be the last thing to cool) and use the cold specs doing the adjustment next day.

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