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I wouldn't point any fingers quite yet! sounds like maybe the stud wasn't fully seated into the block? Or the threaded hole was weak to begin with. I remember hearing Sr20's and arp headstuds wouldn't fully seat? not sure if arp has fixed this issue. I've never owned an sr20 so I'm not too sure!
personally I would upsize the hole to the next arp size and thread it. However I have seen helicoil hold just fine.
Goodluck my dude!
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