J--- which one did you use?? I bought both of them and the red fit snug and the blue was kinda loose. So I went with the red one. My valve train noise stays noisey all the time it doesn't come an go.????

 

I used the red one.. Where is the noise coming from? The top?

 

Yup I have the red one in there too. The noise is from the top. Rockers are dry. Oil pressure gauge at idle the line under 40 psi. Oil pressure goes up as I give it gas but topend is still dry?

 

Silly question, but is it possible that the lifters haven't pumped up yet? Were they sitting dry for a while? (I'm trying to throw some simple ideas out there with hopes that the problem is something simple)

Here's a pic I found after doing a google search for "No oil to top end on LS1"...just happens to be from LS1Tech:

 

Budhayes--Thanks for the pics.The lifters were reused and had oil in'em .I hope. I am looking at the picture and see the barbell in the back if that was pushed in to far it would starve the oil up top??? But then again it looks like the oil pressure sending unit gets it's oil after the barbell correct??

 

I think that Bud is on to something. I checked with Rex and he said "Sometimes the lifters take there sweet time about pumping up." Maybe the lifters need more time to pump up. How long have you tried running it?

 

My 4.8 sat for at least 2 months with no oil in it at all. The lifters must have dried up completely. I "primed" the engine with the plugs out, got pressure, cranked it up, and it started knocking like crazy. And it was worse with the RPMs. Let it sit at idle for a little while. I got scared and started filling up the push rods with a small oil pumper, and it didn't do much. I used 10-30 oil on my first two changes. The eventually filled up after 15 minutes of just running on idle. It sounded pretty bad at first, but it eventually went away.

 

Ok I tried to let it idle but after bout 3 mins it just ****** died...I tried to start it back up and it just turned over no fire.. Soo now I have to get that figured out so I can just let it idle for awhile. I hope it is just the lifters that are dry. The longest I have ever let it idle for is about 5 mins..The noisey valve train scared me. Can or will it do any damage by letting it run dry just to get the oil up there?

 

When I swapped in the 6.0, it took at least 20 minutes for the extremely loud tapping to go away. I was scared too. I thought I bought a lemon of a 6.0.

 

For piece of mind, you could use some assembly lube on the ends of the pushrods and rockers, and maybe even squirt some oil down the pushrod valleys. I think that you should be OK as long as you don't try revving it to the moon until your top end issue is resolved.