LS1Silverado05

iTrader: (41)

What do you guys think the most likely cause of valvtrain noise would be? Its more of a hollow clattering sound. Mostly heard at idle, and about 2100. The car will rip 6000+ without any trouble, but the noise sounds like crap and it driving me crazy. I thought about some aftermarket roller rockers and check the pushrods while I was there. I dont have the ambition to dig lifter deep at this point. Any ideas?...Im always waiting for something to fly apart.

Tainted

iTrader: (9)

where is it comming from exactly? engine bay area? left or right side?

specifics will help pin point the problema rea and the noise maker

mvvette97

iTrader: (18)

Mine and my buddys makes that same sound. Kinda like it's coming from the intake. From what I hear it's because of the harsh lobes on the cam slamming them open and dropping them shut.

8a8mfh

iTrader: (3)

Same here. Lifters replaced at 25,000 miles under warranty, didn't help.
Mine sounds loud under the car but sounds like it's coming from under the intake.
Sounds like total ****.
I've run it hard at the track since, now it has almost 39,000 on it, the noise never got worse.
It's definetly a valvetrain noise.

3fingas

iTrader: (16)

Mine did the same till I switched out the rockers. I also drilled out the lifter holders for better oil return. Dont know which of the two corrected it but it got quiet.

LS1Silverado05

iTrader: (41)

Its both sides kind of...and its definately the top end "light clatter" not a deep knock. I guess I'll just let it be noisey

PREDATOR-Z

Most valvetrain noise on a healthy motor is attributed to too short a pushrod. (ie: too light a preload)

Two things tobe done on a motor especialy if heads have been added.
1- Check your geometry > Wipe pattern on valve tip is well centered
2- Check preload to be within lifter manufacturer margins

BadgeZ28

iTrader: (28)

I have a clacking type sound and assumed it was valve train related. I did some scope listening and could not locate the noise in either valve cover. Actually the injectors produced more noise than I heard from the valve covers. At this point, I am guessing it is the PS pump and I am living with it.

LS1Silverado05

iTrader: (41)

I just used a scope and on each valvecover I just hear comotion, no clatter to speak of. When put to the runners on either side of the intake manifold it is much more audible clatter?...What would I be hearing on the intake?..

8a8mfh

iTrader: (3)

Was this problem common or even found on stock engines with no internal mods?

LS1Silverado05

iTrader: (41)

+1 .. I want to know..because it sure as hell sounds like just a little too much slack..and at certain loads it becomes noisey. More importantly do I need to be concerned with any kind of catastrophic failure because of it...or will it just sound like crap?..Do aftermarket rocker arms have adjustable pushrod cups?..

LS1Silverado05

iTrader: (41)

I'd like to do aftermarket arms if it would maybe fix the problem. But if not, I'll just wait.