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Are you sure it's the valve making the noise? Have found on a few 22re's where the valve cover was over tightened and would hit sounding like valves out of adjustment.
Always adjust cold, part of the reason you adjust valves is to compensate for thermal expansion. Ive also heard of similar things too about over tightening valve covers too.Some valve trains are just noisy.Sure its not worn timing chain guides?
Your getting a "rattling" and not a "ticking" sound? Rattling like a nail in a can? Just to be clear.
Make sure the adjusting screws do not have a groove worn in them. If they do replace them, you will never get a true adjustment if they are grooved.
My 22r has a 'ticking sound' as well, not the valves though it's the fuel pump. One would swear it's a valve but nada
Exhaust leaked are magnified when more is flowing thru it at higher rpms. Weird but I just had a loud ticking noise and found the #4 spark plug backed out. Just enough to make it loud but not enough to totally kill performance. Just a thought.
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