This ones easy....
I don't think you did anything wrong. The threads that hold the rocker arms in place strip in the head from fatigue(they are aluminum). Buy a helicoil or timesert set and fix it.
If you did the head ... I'm sure you can install the inserts without nessary warnings of being careful not to leave stray chips behind.
Michael
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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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