Just my luck, install new sealed power lifters and got truck fired up a couple hours ago and its still making ticking noise when hot. Engine sounds like a swiss watch when cold but as soon as I get the thing hot and work engine, back to that tapping sound that's most noticeable under truck towards front of engine. I can only notice this ticking noise at idle & operating temps, and its most noticeable when I put it in gear while idling. When its in park & there is no load on engine, I have a hard time hearing noise. I dont hear anything coming from exhaust or intake and tried using a stethescope all over the place with no luck pinpointing where its coming from. Very frustrating. Thinking about throwing the towel down for a while. This one has me completely stumped. Other than that, it runs good but am hesitant to keep running it like this.