6.0 ls rocker arms clatter
i just installed a 585 lift cam and replaced the valve springs in a gen 4 6.0 i replaced them after i had a valve spring break and it bent a exhaust valve while on the dyno it had valve springs rated for a 600.lift i just rebullt the engine and installed dual valve springs rated a 660. lift got engine running but the rocker arms now clatter like they are not adjusted rite they were just torqued on a 22 pds like they should be but they are real noisy now been reading and some say its gona make the valves rattle because of the dual valve springs but i dont see why they would be so noisy any body know what i should do to quiteing them down
|
Re: 6.0 ls rocker arms clatter
how did you measure push rod length?
|
Re: 6.0 ls rocker arms clatter
Quote:
|
Re: 6.0 ls rocker arms clatter
Anytime you change cam, lifters, springs head gaskets, rocker arms, you need to check the length of the pushrods. I seem to always end up with shorter pushrods than factory, but that is usually due to the brand of lifter and preload required.
|
Re: 6.0 ls rocker arms clatter
Is true dual springs w/ dampner for a total of 3 springs?
|
Re: 6.0 ls rocker arms clatter
ok i been trying to get the valves from rattelng in my 6.0 ls engine i have measured the pushrods several times and everytime they grow longer and longer and still will not quit clattering when installed i am up to 7.500 and just dont know what else to do the only thing i changed were the valve springs to double springs rated at .660 and installed new gm ls 7 lifters before it had the stock7.400 pushrods what else can i do ?
|
Re: 6.0 ls rocker arms clatter
Are you measuring the pushrods correctly? What are you using to measure them? BTR makes and adjustable pushrod to do measuring with. Also, with dual valve springs you’re going to have valvetrain noise, it inevitable.
|
Re: 6.0 ls rocker arms clatter
Quote:
|
Re: 6.0 ls rocker arms clatter
Um...you cannot measure it with calipers. You have to use the scale on the side of the pushrod length checker.
Maybe there is a different brand that takes the ball and where it pivots into consideration, but I have 3 brands and all of them require you to use the gauge printed on the side of the checker. |
Re: 6.0 ls rocker arms clatter
|
Re: 6.0 ls rocker arms clatter
Quote:
That will definitely tell you if you have the wrong pushrods though, especially if they are too long or too short by a fair amount. I think our OP needs to watch the video and try this before going any further. |
Re: 6.0 ls rocker arms clatter
That’s why I run LS7 lifters. They have a pretty wide range of pre-load.
|
Re: 6.0 ls rocker arms clatter
Quote:
|
Re: 6.0 ls rocker arms clatter
Quote:
I usually buy Morel or Johnsford. Saves a lot of headaches down the road. |
Re: 6.0 ls rocker arms clatter
Quote:
|
Re: 6.0 ls rocker arms clatter
I ordered my LS7 lifters from jegs. They came in an ac delco box. I believe if you order from a reputable dealer it shouldn’t be an issue. You should post a video of the valvetrain noise you’re experiencing.
|
Re: 6.0 ls rocker arms clatter
rattle ls 6.0 https://youtube.com/shorts/YeIUHnEu7LY?feature=share
|
Re: 6.0 ls rocker arms clatter
When I click the link for your video it says it’s private and I cannot view it.
|
Re: 6.0 ls rocker arms clatter
Quote:
https://youtube.com/shorts/YeIUHnEu7LY?feature=share |
Re: 6.0 ls rocker arms clatter
Still shows up as private
|
Re: 6.0 ls rocker arms clatter
Quote:
https://youtube.com/shorts/YeIUHnEu7LY?feature=share |
Re: 6.0 ls rocker arms clatter
That worked. Definitely got some rattle there. I used a method Richard Holdner has a video that checks length by counting the turns to tighten the rocker bolts. Find zero lash then count how many turns it takes to bottom out. 3/4 to 1 and 1/2 turns is acceptable for stock lifters. I have morrels and had 3/4 of a turn with stock 7.4 pushrods with my setup. So far so good
|
Re: 6.0 ls rocker arms clatter
i pulled the engine apart only thing i could find wrong was that all of the lifters were collapsed i dont why they all failed but they did going back with some other brand delphi or elgin
|
Re: 6.0 ls rocker arms clatter
Quote:
As stated previously, I would go with Morel of Johnsford. They both manufacture their own lifters and stand behind them. |
Re: 6.0 ls rocker arms clatter
Quote:
Have you researched over at ls1tech? Lots of info there. |
Re: 6.0 ls rocker arms clatter
This sounds a lot like a missing or defective oil gallery dog bone...the factory ones are made of plastic and sometimes fail, resulting in oil bypassing the filtering process and upsetting the oil flow throughout the engine.
The dog bone is located in the main oil gallery, drivers side of the engine, accessible under the rear main seal retainer.... See link for a video explaining its role.... https://www.youtube.com/watch?v=V7p0h2VwGP0 |
Re: 6.0 ls rocker arms clatter
Quote:
|
Re: 6.0 ls rocker arms clatter
Quote:
|
Re: 6.0 ls rocker arms clatter
Where did you take the oil pressure reading? Was it down by the filter, or at the top of the engine where the factory had a sensor? I don't recall if the bypass on the pan is before or after the filter, but could you have something wrong with the pressure relief valve that is in the pan on some models and it is allowing the pressure to bleed back into the pan? This might give you a good reading at the bottom of the engine, but a low reading at the top.
|
Re: 6.0 ls rocker arms clatter
Make sure oil pressure relief valve is ok....see the video for an explanation...
https://www.youtube.com/watch?v=jNafsqH0vPI :chevy::chevy::chevy: |
Re: 6.0 ls rocker arms clatter
Quote:
|
Re: 6.0 ls rocker arms clatter
5 Attachment(s)
here is some pics of the new ls7 lifter when i first got them i noticed that they will push down real easy not like the old ones that came out of it it will not push down at all and the new delphi ls7 lifters i got from btr will not push down either i also took a pic of the new ls7 lifter and took a old apart
|
Re: 6.0 ls rocker arms clatter
1 Attachment(s)
breakdown pic
|
Re: 6.0 ls rocker arms clatter
In the smaller inner sleeve there is a metal cap in one end that contains a small metal ball. You can pop the end of the sleeve off with a screwdriver.
I have seen them MISSING the steel balls, hence no oil pressure in the lifter body and no hydraulic lash adjustment capability. To test new lifters, stand them up in a tray of clean oil and push down on the top cap where the pushrod sits. The lifter should fill with oil but then push back against the pushrod as it "pumps up" .... lifter float (the lifters over pumping up) back in the day lost many races! Back in the day I would make hydraulics into solids by machining solid body inserts for the main bodies. :chevy::chevy::chevy::chevy: |
All times are GMT -4. The time now is 02:53 PM. |
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com