If the sound isn't very bad and the oil pressure is with in normal range,it probably isn't anything to worry about ,That being said it could be dirty or week lifters or some wear on the bearings But if the oil pressure is good and the sound goes away after it warms up I would first try seafoam engine cleaner of free valve ,Can be bout at most parts stores,and added to the oil a short time be 4 the next oil change ,IF fore some reason it would git wheres the it may need a new lifter or bearings, PS see replacing lifters or bearings in a repair manual or take in for service..hope this helped.
How's your oil pressure on your truck? The only way to identify where the noise is coming from will probably require tear down of the engine to identify worn parts. But if you have weak oil pressure repairing the cause of that could help or solve the other issue, GL
Ticking sounds that are worse when cold usually indicate a lifter issue or valve train
Lifters require pulling the intake and the heads
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