RALLDU

done a head and cam change. now i have valve noise(rattle,pecking). i installed new comp lifters and one peice pushrods. i removed the valve covers and adjusted rockers a few times still there. cranked car and inspected. there are a few that arnt getting any oil through the pushrods. what to do. ive been dealing with this for a week and a half. getting tired of pulling of the valve covers. need help. PLEASE

heavymetals

iTrader: (3)

Your not gonna like this ansewer.

You may have to pull the head and remove and inspect the lifters.

If you don't have any oil flowing from the lifter through the pushrod, something is not good.

Did you "prime" them before the install?

RALLDU

yeah. i primed them before hand. no way to check them besides pulling the head. If not how would you check them once you got them out.

ShevrolayZ28

iTrader: (4)

How's your oil pressure? And which oil pump are you using?

RALLDU

next question how bad would it hurt to drive it or for it to run if this is the problem. come on guys give me some help please.

RALLDU

im using a ported and polished ls6 oil pump when cold and at wot about 50 psi and at idle warm about 40. i think, preddy sure.

ShevrolayZ28

iTrader: (4)

That's little low for that pump IMO. I don't know for sure but that oil pressure should be enough. Anyone else comment on this?

Is there a chance that there is some debris inside the pushrods?

I'm afraid it's sounding like you'll need to pull the head and inspect the lifters.

Did you modify the lifter tray at all?

RALLDU

Yes. drilled oil drains. Did as directed by ls1/ls6 performance book.

98A4LS1

iTrader: (1)

40 psi at idle hot is normal.

ShevrolayZ28

iTrader: (4)

I wish I could be more helpful. I'm be no means an expert with this stuff. But is there a chance that the lifters are not facing in the correct direction to receive the oil?

.....The drill mod wouldn't cause your problem IMO.

RALLDU

no problem but i was kinda wondering that myself but i looked through the performance book for ls1/ls6 under lifter install and i didnt see anything. good question COULD ANYONE HELP ON THIS QUESTION.

VORTECFCAR

iTrader: (2)

by adjusted, you mean torqued to 22 ft-lb? you know the valvetrain is non-adjustable right?

RALLDU

i installed adjustable roller rockers with guide plates.

ShevrolayZ28

iTrader: (4)

Ralldu, it might be helpful to give some more specifics about your set up. Like valve size, cam size, type of valve springs.

And I guess we can't rule out lowish oil pressure as the cause. Low pressure of course could cause a colapsed a lifter of three. I think this might cause oil to not get up the pushrod, maybe.

If you have a pushrod length checker, I think you could diagnose a colapsed ligter. IE if the pushrod checker indicates a disproportionately long pushrod for a given cylinder it would suggest that the lifter is shorter than it should be, in other words colapsed.

ShevrolayZ28

iTrader: (4)

Ok, forget the pushrod checker then. If you had to pick up a lot more slack at the rocker than the others, that might also indicate a colapsed lifter.

RALLDU

ill give that a try when i can and try to post a reply asap. thanks for all the info. if anyone else might of had this problem and has a fix please help. thanks everyone for the input. i helps alot.

daryl2cb@yahoo.com

iTrader: (2)

were you coming from a stock setup?

Lifters direction has no meaning, several post here on that, search or call TSP

If you aree coming from stock setup, your whole valve train will get louder.

white2001s10

iTrader: (4)

What did you set your preload to? .005"? .050"?

RALLDU

i came from a stock set up. and i dont know what the preload is set at. many people and a few articles ive read informed me to adjust them down while twisting the pushrods till there was drag on them then torque. question: why would half the rockers be getting oil through the pushrods and half of the not, while idle. and the noise sounds like it is coming from the driver side. ive checked everything i could think of. thanks for the input everyone.

white2001s10

iTrader: (4)

To clarify this problem a bit more we can say that you do not know how to set-up a valvetrain, you're getting noise, so you come on here to ask why.

Stock LS1 valvetrain is not readily adjustable as is unless you convert to studs & guideplates.

In stock configuration, the way they are adjusted is by the use of different length (the correct length) pushrods, and/or rocker shims (spacers).
To get this right the first step is to measure the preload on the lifter, and measure the rocker to valve geometry... as in the contact patch on the tip of the valve.

I suggest NOT skipping the first step in this process.