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Why are you using a feeler guage for the valves? A dial indicator guage is much easier and more accurate.
This probably dosen't have much to do with the noise as a couple of thou either way probably will not make a differen't sound. You should hear something, as these are solid lifters, they are not noiseless lifters. A very faint clicking is normal, a loud clicking is not. If you have heard a bad hydrolic lifter it makes a noise too loud for a properly adjusted mechanical lifter. But a properly adjusted mechanical lifter is louder than a good hydrolic one. Same sound but much much fainter. a gentle clicking.
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