The adjustment process isn't that easy & many times you will get a FALSE reading. BEFORE you try to make any adjustment allow the cam lobe on the incorrectly adjusted valve completely depress that rocker for 45-60 seconds. Then put the TOOL over the rocker & look at the groove on the go-no part of the shaft. IF you are still off then get the next smaller(or larger) shim & DO that same process with the cam lobe holding the valve open & the lifter compressed...then you should see a change in position.

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