Ls7 lifter preload

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Aug 28, 2017 | 07:50 PM

Dirty_Bird

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From: Murica

Ls7 lifter preload

What are you guys running for preload on here? Ive read 1/4 and then 1/2. Whats the consensus say?

Aug 28, 2017 | 08:37 PM

SS RRR

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From: Jackstandican

3/4..........

Aug 28, 2017 | 09:40 PM

BALLSS

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^^^^^ this, 3/4

Sep 2, 2017 | 01:14 PM

Fast355

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From: Euless, TX

Quote:

Originally Posted by ******

^^^^^ this, 3/4

With 1.7 rockers and the 395' marine cam aka Ramjet/HT383 cam I found 1 full turn to be ideal. Less than 1 full turn had very noticeable lifter noise on startup.

Sep 2, 2017 | 01:44 PM

Fast355

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From: Euless, TX

Quote:

Originally Posted by ******

^^^^^ this, 3/4

With 1.7 rockers and the 395' marine cam aka Ramjet/HT383 cam I found 1 full turn to be ideal. Less than 1 full turn had very noticeable lifter noise on startup.

Sep 2, 2017 | 01:51 PM

BALLSS

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factory lash is 1/2 to 1 1/2 turns...so somewhere in between is what most do

with that said I have only used factory original lifters or Comp 850's, not "LS7" lifters so don't know the plunger travel comparison between stock and LS7....but assume it is the same or very close.

Sep 2, 2017 | 05:22 PM

pantera_efi

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From: Santa Ana, CA. USA

Lifter Pre-Load with AL BLOCK

HI ALL, MY "tech" is also 1+.

This FACT is due to AL block growth.

FIGHTING this problem was CORRECT YEARS AGO !

THINK, DO NOT FLOAT the Valve Train.

THAT "tech" was for NHRA S/S class. (1/4 turn)

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Sep 3, 2017 | 12:10 AM

Dirty_Bird

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From: Murica

Tried 3/4 turn, little loud. Gonna try 1 turn and see what it does

Sep 3, 2017 | 09:28 AM

#10

350 groundpounder

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From: Michigan

Its a possibility that a lot of the clatter you are hearing is the roller rockers if you have them. Lifters should be quiet even at 1/4 to 1/2 turn unless something is wrong. I have the sewing machine sound rather at 3/4 turn or 1 turn. Aftermarket valvetrain usually isnt stock silent.

Sep 3, 2017 | 01:24 PM

#11

BALLSS

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Quote:

Originally Posted by 350 groundpounder

. I have the sewing machine sound rather at 3/4 turn or 1 turn. Aftermarket valvetrain usually isnt stock silent.

yeah you would think exploding wallet, highly machined, roller needle bearing rockers would be quieter than some stamped steel riding directly on a PR...but no

at 3/4 turn mine have the "sewing machine" sound