could be a couple of things...bad lifter(doubt that) rocker stud is pulled up,check the hieght compared to others or the most likely cam lobe going flat..you might want to look at the pushrod..see if the ends are messed up, also check the rocker where the pushrod goes into..if it turns out to be the cam lobe..dont drive it ...the cam guts do very bad things to bearings
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67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44
Anderson,CA
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