Lifter preload -875s

[brock1949]

I know this has came up time and time again, I spent hours searching this forum and i'm coming up with so so results.

Last night i was going to setup my rockers and did a little testing with a dial.. 1/4 turn i'm pushing 10ths preload, I consider 0 lash when i start to feel resistance spinning the pushrod. After reading the directions it appears these require 1/8th turn which puts it in 4-6ths preload range and as far as i understand this is correct.

My concerns are..

what does everyone else consider 0 lash
Are the 875-12's really a problem..
under 6000 rpm motor, under .525 lift
how much preload/turns are you guys putting in

Last time i set this up it was factory 94 rockers and i did a half turn and got to do it again on several making noise so i'm really on the fence about this 1/4 turn 4ths preload.

The lifters were soaked in oil.

Thanks again
Brock

 

[Aeroking]

Re: Lifter preload -875s

i just put a new set of 875s in mine this weekend due to previous failure. I had 1/4 turn lash on mine, and had a couple collapse.

I'm going to do 0 lash this time. comp says between 0 and 1/8 turn for 875s

I rub dry the top section of the pushrod (not the tip). And spin the pushrod with my fingers, while tightening the polylock with my other hand. When i feel drag on the pushrod, and it doesnt spin easily anymore, i know i'm there.

 

[brock1949]

Re: Lifter preload -875s

thanks for the reply that goes along with what i've been reading just wanted to hear it from someone who's been there. My stock Lifters I turned them 1/2-3/4 and had great luck and almost did it to these after having so many people i wasted money buying stock lifters. So i looked through the directions and saw the 0-1/8 turn and just gave up for the night until i looked into it more.

I called comp today and he told me 1/16 to 1/8 turn tops but normally runs them at 0 lash and has no issues. I told him my concern was they would be loose and tapping etc which every time i told him that he kept saying these will be noisy setup correctly even. So i'm not really sure how to take that lol, First time i put roller rockers on the stock lifters i did the 1/4 turn on them and a couple made noise and i ended up cranking them down another 1/8-1/4 (from what i remember). He kept telling me they wouldn't be quiet and i could return them and get the 850's which he basically said they were stock lifter. He also said they setup all lifters dry without them pumped up if anything just soaked in oil.

So we'll see hopefully shortly.

 

[wildphil]

Re: Lifter preload -875s

I used 875's on my truck. I set them at 0. Put about 400 miles on them so far and am not getting any noise.

The stock injectors on these trucks sure are noisy though. When I upgraded the injectors it sounded much better under the hood.

 

[nallj92]

Re: Lifter preload -875s

i think i have mine (875's) at 1/8 turn, they are a bit loud, cant do much about that really unless replace them with 850's.

 

[brock1949]

Re: Lifter preload -875s

sounds good guys glad to hear someone else has them in at 1/8 and no issues. I don't mind some noise as long as i know its not an issue.