I had done something similar after the bolt turn method was being mis-used. I eluded to it in my post above, but didn't go into detail. There is actually a pretty good thread on this forum on the same topic located here: Link

 

Thanks vettenuts, can't be more informative indeed.


I like this diagram as well:


https://ls1tech.com/forums/generatio...l#post14969990


Christian

 

Yes, the diagram was very helpful because trying to explain without it is tough.

 

What I did was the EOIC method. Once on the base circle, I put the push rod checker in place, then tightened the rocker to 22ft lbs. Next I turned the checker till it took the slack out of the rocker, then pulled the checker and took my measurement and added the desired pre-load to that number. Does this sound right? Just curious because my valvetrain is stock quiet at idle but I get some sewing machine sound when cruising around 15-1600 rpm.

 

That is the correct way. How much preload and what lifter are you running?

 

Morel 5315 @ .060 preload. 7.325 Manley heavy wall push rod.

 

Did you use the Comp tool? If you did, maybe check and see how Manley measures their pushrods. There is two ways of taking measurements for pushrods. Comp takes their measurement under the tip of the pushrod and Manton measures overall length. I would assume that Manley would be the same as comp but it might be worth looking into to be sure you are running the correct preload.

 

We measured end to end using the pushrod measuring chart. The Manley is 7.325 end to end and the checker was 7.265 end to end after finding 0 lash. A few guys I have talked to that are pretty knowledgeable with LS stuff say it's normal. Just figured I would ask here and get some opinions. I feel the preload is correct being how quiet everything is at Idle and cold. I do not here any sewing machine sound until its hot and cruising low load around 1500rpm.

 

As the all aluminum engine heats up and expands you do loose a bit of preload, however you're still ball park close for sure to what folks say that lifter needs. Also the oil heats up, gets aerated and is slightly less effective at doing it's job inside the lifter plunger. Lastly that 1.85 ratio rocker, while being a very nice piece, it is transmitting ALOT of motion to the valve tip and because of the density of it's material it also radiates a considerable amount of sound.
Back when I had a GEN I 434 stroker with a Hard Blok'd crank case, on cold start up I simply could not believe the noise/sound coming from the block/pistons/valve train. As it heated up and every thing settled in, the shear noise was cut in half. SOLID BLOCK equals no sound absorbtion.
I believe you picked great parts Joe and I'd hate to see you rack your brain trying to chase something that may not be attainable. You gained at least a hundred horsepower and one of the unintended consequences of that gain is some valve train noise. Crank up the Metallica and use the loud pedal at will !!!!.....

 

Thanks Jim! I do sometimes tend to overthink things in the quest for perfection. I have no problem with a little extra noise long as it's normal.