Lifter preload
02-09-2016 | 03:24 AM
#2
On The Tree
Joined: Jun 2012
Posts: 122
Likes: 2
Hey yeah man if your using your stock rocker arms push rods they torque to 22lb ft
And if your using after market springs your totally not going to want to torque them down in the wrong sequence.. here check this pdf though its for a LQ4 all gen 3 & 4 use the same torque sequence.. See pages 180 and 181
If you try and torque the rocker arms down while they are on the cam lobe lift, you could run the risk of stripping the threads out of the head where the rocker arm bolts go into...
Other than that, i have no idea about preload gonna have to wait for someone who knows more than me to come along..
Edit: yeah so from the research iv done, stock preload is .060 and some say its .080 and most people who are running performance cam, lifter and spring set up like .070 to .075 others say .020 to .060 for more aggressive ramp rate cams
Also some are saying, from zero lash, a turn and a half is most of the time good for about .075 preload..
Also i find that, those who run LS7 lifters say anywhere between .040 and .060 is fine.. others say .080 and yet others say between .050 and .100
But from what i have just read and come to understand is, id go with anything between 1 turn and 1.5 of a turn after zero lash and call it good..
Though myself, iv never had to worry about preload as iv never ran into valve float.. alls im running is a hotcam with LS6 springs and stock push rods
Ha now im really interesting in learning more about this but ya..:end Edit.
Edit: Here this is a good read https://ls1tech.com/forums/generatio...r-plunger.html :end Edit
neways hope this helps ya
peace man
And if your using after market springs your totally not going to want to torque them down in the wrong sequence.. here check this pdf though its for a LQ4 all gen 3 & 4 use the same torque sequence.. See pages 180 and 181
If you try and torque the rocker arms down while they are on the cam lobe lift, you could run the risk of stripping the threads out of the head where the rocker arm bolts go into...
Other than that, i have no idea about preload gonna have to wait for someone who knows more than me to come along..
Edit: yeah so from the research iv done, stock preload is .060 and some say its .080 and most people who are running performance cam, lifter and spring set up like .070 to .075 others say .020 to .060 for more aggressive ramp rate cams
Also some are saying, from zero lash, a turn and a half is most of the time good for about .075 preload..
Also i find that, those who run LS7 lifters say anywhere between .040 and .060 is fine.. others say .080 and yet others say between .050 and .100
But from what i have just read and come to understand is, id go with anything between 1 turn and 1.5 of a turn after zero lash and call it good..
Though myself, iv never had to worry about preload as iv never ran into valve float.. alls im running is a hotcam with LS6 springs and stock push rods
Ha now im really interesting in learning more about this but ya..:end Edit.
Edit: Here this is a good read https://ls1tech.com/forums/generatio...r-plunger.html :end Edit
neways hope this helps ya
peace man Last edited by the404man; 02-09-2016 at 06:08 AM.
02-09-2016 | 07:22 AM
#5
Thread Starter
Launching!
iTrader: (6)
Joined: Feb 2012
Posts: 221
Likes: 15
From: Cape Girardeau, Missouri
i got the morel 5315 lifters and yes i did buy the push rod checker. my question was hit right on the head i have a btr stage 4 cam. its kind of digressive. i just wanted to see where i should land
02-09-2016 | 07:45 AM
#6
5315's call for .050 - .060 preload. Get you required preload by measuring push rod length, add the desired preload to the over all length, order and install correct length push rods, then tq the rockers to 22ft lbs if using stock rockers.
Last edited by kinglt-1; 02-09-2016 at 07:50 AM.
02-09-2016 | 07:54 AM
#7
TECH Fanatic
Joined: Jul 2007
Posts: 1,716
Likes: 276
From: Wilmington, De
You need to buy an adjustable pushrod checker to find the correct pushrod length you need. Find zero lash with the lifter on the base circle of the camshaft and add the desired preload as specified by the lifter manufacturer. Never assume 7.400" pushrods are correct.