No response in the truck forum, I'll try here.
While the trucks down I decided to check my lifter adjustment for the first time since the new engine. Comp wants 0-1/8th turn preload. I found them all at 1/2 turn. I set them at 1/6th turn, just because it is easier to see 1/6th turn than 1/8th with six point nuts.
It will be awhile before the truck's running again, so I thought I would ask if anybody else has made a similar adjustment, and did it change the lifter noise?

 

That is still too much preload. Set them to zero lash and lock them down. Those lifters only want .002"-.003" of preload. If you are after quiet lifters, these are not for you. Go to the Comp 850's or GM LS7.

Shane

 

Is where I have them dangerous?
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I would have never allowed the engine builder to install these lifters if I knew how they would make the engine sound like it is ready for a rebuild. Maybe next year I'll change to the LS7 lifters.

 

I would say you are probably not doing your valvetrain any favors with them set like that. Believe it or not, if you back the preload down to where it should be, the valvetrain might get quieter. BTW, what rockers are you using?

Thanks,
Shane

 

Comp Pro Magnums, and Thank-you!

 

I would go 0 lash and no more then 1/4 turn. You will beat the gold retaining clips out of them if you go anymore then that.

 

Been there, done that to 4 of them.

 

I'm at 1/6th, my calculations show that to be about .007 inch. 1/4 turn would be about .010 inch. The builder had them at about .021 inch. Thanks.

 

With a 7/16 stud, 1/12th of a turn was very close to lash. That is easy to guage if you use a 12 pt.box end wrench. I think pegging the factory tach had something to do with my clips breaking.

 

My calculator says that 1/12th turn of 20 tpi gives you .004 inch. My 3/8 studs are 24 tpi (threads per inch).

 

I'd just shoot for as close to zero lash as possible.

Shane

 

I guess I should have asked before I adjusted them and put the blower back on.