<VV> Changing rocker stud o rings

[James Cuneo]

So I believe I have a leaking oring under one of cylinder 5's rocker studs. Should I loosen top cylinderhead nuts as well as rocker studs? I have copper head gaskets on 140 heads. Seems to only loosen studs would cause serious imbalance on head and gasket?
Thanks,
Jim C  Norcal  65 corsa turbo 140

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