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Its pretty simple. Get cylinder your working on at tdc (both valves FULLY closed). Then tighten rocker nut till theres no lash in pushrod ( twist it gently with your fingers back and forth). Once youve done that tighten an additional 360 degrees. No more or you can cause rough idle or even a no start condition. I set mine at 3/4 turn past zero lash to be safe.

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Q: How do you set valve lash into 5.7 liter vortec?
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