I had thought of that, but what is odd is that it seems at idle that it is only one or two occurrences and the truck is very quiet except for the tapping. If I idle the truck around in drive, it isn't a continuous noise like every lifter is ticking or one bank of cylinders is louder than the other. Instead, it seems to my very untrained ear to only occur at half of the speed of the engine speed, and it only occurs twice throughout the firing order (hence the reason I thought valvetrain). The first one is a loud tick then a split second later a tick occurs that is half as loud, and then it is just the hum of the motor until the next tick. The loud one is regular, but the second is somewhat intermittent. I thought maybe it needs adjustment too, but the chilton service manual it states that the valvetrain requires no periodic adjustment unless the heads are removed or the rocker shaft is removed.
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