WEVE REPLACED TWICE
There is not enough spring travel on the valves The rockers used are incorrect for the cam used and the lift of the cam is making the rocker push the valve too far down and is binding up the spring. You may have something else wrong like extra spacers under the valve springs , valve guides not in far enough valve spring retainers not correctly positioned or wrong inner spring that is binding up. Turn the cam over carefully and see it the distance in the spring coils disappears before fully open the valve.
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