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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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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