Comp 875 lifter adjustment
06-24-2009, 02:54 PM
#1
Comp 875 lifter adjustment 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?
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?
06-25-2009, 04:06 PM
#2
FormerVendor
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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
Shane
06-26-2009, 10:34 AM
#4
FormerVendor
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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
Thanks,
Shane
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06-26-2009, 03:44 PM
#9
Staging Lane
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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.
