I've got a 1999 K1500, 5.7L 350 Vortec and it is driving me nuts right now. I have a ticking noise that is really rough when you first crank it up but it isn't there all the time. The noise also usually goes away after driving a mile or so or just allowing the engine to ideal for a few. It is bad sometimes and then sometimes it is very faint. Sometimes the sound will come from the passenger side and sometime it will come from the driver's side. I first thought is was the lifters but according to the guy that does all of our engine work, it isn't. He said that he thought it was something to do with the piston heads and the way the are built, I think (my dad relayed this to me so if something sounds a little of help me out). Supposedly this seems to be a common problem because there are a few trucks that I've heard of this happening to. Well according to him (BTW-this guy has never screwed us so I'd like to think he is telling the truth) the only way to fix this is to either rebuild the motor or put a new one in. SO, this is my situation. I will not even be able to think about doing either of these options until later on this summer. I was told that most people just live with it but I'd like to know is there anything that I can do to help the situation? Types of oil? Additives? anything...... Also, the truck is burning oil, about 1.5 quarts in 3K miles, would this be the reason for it burning oil? Any help would be great. I don't know much about engines so this is a fairly new ball game for me. Thanks!