If the noise stops after the engine runs for a while ,the oil filter bypass valve may be leaking fit a new filter. If the noise is there at all times you have a faulty valve lifter.
Take it back to whoever did the work and let them find the problem. They should stand behind their work. if that does not work then what kind of noise is it making. If it is a tapping noise then the valves are not adjusted like they should be.
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