warrab

Hi, I'm new to the board and I'm hoping someone can help me out. I've got a 03 Silverado with a 6.0L It was running rough and I did a compression test on it to find 2 dead cylinders, one on each bank. I took a valve cover off and everything looked fine. I changed the valve springs on the dead cylinder but it didn't help. Took the head off and pulled the lifters. Took them apart and everything looks good. Pistons are all fine. I put it back together and still the same thing. I then tried loosening the rocker bolts and then just tightened them finger tight. Tried it again and got 170lbs. I'm puzzled. Seems like a valve is getting held open but how? Anyone have any ideas?

RockinWs6

Lifters are stuck holding the valves open. Replace um or clean them properly. Doesn't take much dirt in one to cause them to do this. Also check the preload incase someone changed push rods. should be less than .100 thous

warrab

Are the lifters in these motors a common problem? I'm use to old school small blocks and never came across this. Where does the oil go after entering the lifter? Could something be blocked and not letting the oil out?