I think it would usually be just the opposite, if the valve or valve seat was worn it would allow the valve to move further in to the seat, not causing a gap between it and the rocker arm and lifter. “Easy” test, pick a handful of valves or the ones you see wear on and move the engine in partial cycles and try to insert say a spark plug gapper (or other slimline measuring device) between the rocker arm, valve steam and lifter. I know you said you’ve rebuilt the lifters but historically a “tick/tap” is usually caused by a stuck lifter or liter bleeding oil pressure off to quickly.
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