Maybe you did not have the rocker locked down properly and it loosened up? If it definitely sounds like a rocker arm, then I would readjust them all to be safe.
If you keep getting ticking after valve adjustments you might have a wasted guide. That will usually, but not all the time show oil on the plug.
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1988 Mustang GT
stock bottom 302, C4
10.9 @ 128 with 8 psi of Novi 1000 boost!----STOLEN
1989 Mustang notchback
Warmed up 306 with a Procharger.
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