6.0 ls rocker arms clatter

[bigdaddy4x4]

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

[87chevy.com]

how did you measure push rod length?

[bigdaddy4x4]

Originally Posted by 87chevy.com

how did you measure push rod length?

i did not measure them using the stock 7.400 push rods i had no problem with them using the 600. lift single springs just now with the dual 660. its causing all the noise i guess i will pull the valve covers and check the pushrods i did use new lifters they are oem dont know if they maybe part of the problem

[Joyridin]

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.

[HOGDADDY]

Is true dual springs w/ dampner for a total of 3 springs?

[bigdaddy4x4]

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 ?

[jessemthompson]

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.

[bigdaddy4x4]

Originally Posted by jessemthompson

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.

i am using a push rod checker i have to keep taking it in and out to measure it with a dail caliper there is not enough room to twist the pushrod checker on the head it seems like everytime i think i have the lengths rite i will turn the engine over and they will change i am up to using 7.500 puhrods now and they still clatter i used the pushrod checker and measured one push rod to 7.612 and at 7.612 the valve spring is completely down and the valve hits the piston so between 7.500 and 7.612 is far as i can go with the rocker i am doing something wrong and dont know what i am wondering if i need to buy a set of ls adjustable rockers ?

[Joyridin]

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.

[jessemthompson]

Check this out.

https://youtu.be/2HtgGp5tmgI

[Joyridin]

Originally Posted by jessemthompson

Check this out.

https://youtu.be/2HtgGp5tmgI

The problem with that is most aftermarket lifters call for a specific preload. Mine stated .035" +/- .01". That is a pretty tight tolerance and considering most pushrods come in .025" increments, you need to be accurate.

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.

[jessemthompson]

That’s why I run LS7 lifters. They have a pretty wide range of pre-load.

[bigdaddy4x4]

Originally Posted by jessemthompson

That’s why I run LS7 lifters. They have a pretty wide range of pre-load.

i give up i am using the ls7 lifters just put in some 7.550 push rods i measured them like the ones before with a push rod checker and dail caliper the lash goes away but rite after starting it they go rite to clacking starts rev it up the really clatter done gone thru 4 different sets of push rods from a 7.400 to 7.550 i tryed a 7.612 push rod and the valve hits the piston so i cant go with no longer push rod

[Joyridin]

Originally Posted by bigdaddy4x4

i give up i am using the ls7 lifters just put in some 7.550 push rods i measured them like the ones before with a push rod checker and dail caliper the lash goes away but rite after starting it they go rite to clacking starts rev it up the really clatter done gone thru 4 different sets of push rods from a 7.400 to 7.550 i tryed a 7.612 push rod and the valve hits the piston so i cant go with no longer push rod

The problem with LS7 lifters is you cannot figure out who makes them anymore and if they are the good ones or the junk ones.

I usually buy Morel or Johnsford. Saves a lot of headaches down the road.

[bigdaddy4x4]

Originally Posted by Joyridin

The problem with LS7 lifters is you cannot figure out who makes them anymore and if they are the good ones or the junk ones.

I usually buy Morel or Johnsford. Saves a lot of headaches down the road.

yea there sell alot of junk ones i got them off ebay they came in a ac delco box but that doesnt mean they are orginail gm i always find out things the hard way

[jessemthompson]

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.

[bigdaddy4x4]

rattle ls 6.0 https://youtube.com/shorts/YeIUHnEu7LY?feature=share

[jessemthompson]

When I click the link for your video it says it’s private and I cannot view it.

[bigdaddy4x4]

Originally Posted by jessemthompson

When I click the link for your video it says it’s private and I cannot view it.

sorry try this one

https://youtube.com/shorts/YeIUHnEu7LY?feature=share

[Squish72]

Still shows up as private

[bigdaddy4x4]

Originally Posted by Squish72

Still shows up as private

try again
https://youtube.com/shorts/YeIUHnEu7LY?feature=share

[Squish72]

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

[Joyridin]

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.

[AussieinNC]

Make sure oil pressure relief valve is ok....see the video for an explanation...

https://www.youtube.com/watch?v=jNafsqH0vPI

[bigdaddy4x4]

Originally Posted by Joyridin

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.

when i first installed the 585 cam and started the truck the dash oil gauge showed no oil pressure then it would shoot up to 40 and go back down to zero i pulled a valve cover and seen it was pumping oil so i went and put a gauge on the oil cooler line at the oil filter it showed 50 psi had to replace the oil sender it still only reads less than 40 psi on the dash when i put in the new the ls7 lifters the oil psi only sets at 20 psi on the dash i have not checked with a gauge at the oil cooler again with the ls7 lifters i could never get them to remove the rocker arm lash i will pull the pressure releif valve in the oil pan and get a new one put in just to be sure