Ok - so I purchased a set of fully adjustable roller rockers, for my Lq4 project.
They are made by Pro Comp
Nice looking stainless pieces.
However - no instructions.

What is the proper preload on an adjustable LS derivitive rocker
1/4, 1/2, 3/4 or full turn past static cold set?

or am I waiting for a running engine and loosening till they clack and tighten them whatever amount of turn for proper preload?

Any help would be appreciated as there is zero info to be found so far in my searches online anywhere on LS adjustable rocker usage.

thanks

 

It depends on the lifter. If your specific lifter needs .050" preload, you turn the adjuster on the rocker to get the .050" preload. Using the turn method won't work unless you know how much preload is achieve with each turn of the adjuster.

 

Contact the manufacturer, or check it yourself, but you need the thread pitch of the adjustment bolt. From that you can determine the turns required for proper preload of whatever lifter you are running. Not sure how tight your setup is, but you also have to take care in adjusting slowly so you don't drive the valve into the piston. This will allow time to bleed off the lifter while you adjust the preload.

 

The stuff you mention is in regards to non adjustables

with the exception of BBC motors that want 1 full turn, , adjusting hydraulic lifters, historically, has been tighten to stop clacking and then an additional 1/4 or 1/2 turn - no matter whose lifter was under the pushrod
Are you telling me that the LS motor is so different that the old fashioned adjustment proceedure wont work
All i was looking for was a known manual adjustment - whether it is 1/4 1/2 3/4 turn or?
Or is it maybe that few or none have switched to adjustable rockers on the LS so there is no data base for a standard tightening adjustment from experience??
thanks for the input

 

FWIW, scroll down just a little. http://www.compcams.com/Technical/In.../Files/250.pdf

 

thank you Sir - that is exactly what I was seeking for info - perfect

 

Information provided was specific to the Gen III LS motor. The Comp reference above is not. You don't provide any specifics on your setup so responses are general in nature. If you run a Comp R lifter or Morel or GM, they all have specific lifter preloads and are all completely different.

 

Again, you're preloading the lifters and different lifters require different preloads. The old SBC/BBC stuff was the same way. The method you know might work for mostly stock parts, but switch to a short travel hydraulic lifter or a stud with a different thread pitch, and you could have problems. The lifter doesn't know how many turns you tighten the rocker down, it only sees the distance the plunger is depressed. As I said, you can use a turn method IF you know the amount of preload achieved from each turn.

This one is LS specific and actually mentions manufacturers' preload:

http://www.compcams.com/Instructions/Files/151.pdf

 

thanks everyone - good info