Stock 5.7 tbi valve preload

[Chaz]

After setting the valve lash to zero how much preload for a stock 5.7 tbi,,,,1 turn, 3/4 turn, or 1/2 turn???? Im looking for the safest bet for a home mech so as not to damage anything,,,never done this before and don't really trust my zero lash haha,,,,

 

[PrairieDrifter]

3/4 of a turn is what I usually do. Big blocks are a full turn and they say that small blocks can be a 1/2 or 3/4

 

[Chaz]

Thanks,,,,I appreciate the reply,,,

 

[PrairieDrifter]

 

[chengny]

To set stock preload, continue to tighten the rocker adjusting nut - do not back off. How much to tighten the nut (and pre-load the lifter) is the subject of countless discussions.

But truth be told, however much you decide to preload (1/2 turn, 3/4 turn , a full turn) - it is not that critical. Just be sure that you are consistent and preload all the lifters the same amount.

The plunger of a properly preloaded lifter should be at approximately the mid-point of it's total available stroke.

As it turns out, 1/2 of the total plunger stroke of a stock lifter is just about equal to the cross-sectional diameter of the retaining circlip.

So, when properly preloaded, the gap between the top of the plunger socket and the bottom of the circlip is equal to the cross-sectional diameter of the circlip. The image below explains better:

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[circuitguy]

For a standard hydraulic set up go to zero lash then do 3/4 turn. Should work fine.