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Brent,
Are you using bolts or studs to hold down the rockers? If bolts , it's possible that you are bottoming out before fully torquing down -thus the stands lift throughout the valve train causing haywire adjustments on lash. Its best to run bolts down and measure free length against the rocker stand height. If you are using studs, lifting rocker stands should not be a problem. Never use bolts in the aluminum heads because you will be asking for trouble.
Paul
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