broken rocker arm mount

What is your question?

Bill Larson NE 82ND and NE Fremont St., Portland, Oregon Pontiac Gran Prix SE 2003, 3100 V6, 181,000 mi. A rocker arm mounting stud for one cylinder has pulled out (stripped) and was repaired/remounted with a heli-coil threaded seat. It has come loose again. What part needs to be replaced in order to resolve the problem? Is it the head? Would it be smarter to repair it that way again, or replace the block/whole engine with a used/rebuild, or scrap the car? Suggestions are welcome!

How long has your 2003 Pontiac Grand Prix had this problem?

Second time