Can you push down on the pushrod cup and get movement? If the cup is frozen in place then cranking in the preload from zero lash will hang the valve open. Since you only had problems on only a couple lifters, I'd rule out the possibility of solids.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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