If you can't get the plug back out, just leave it in there, I've seen a lot of crap inside of water jackets that has no effect on engine cooling.
This is exactly why I made the recommendation I did, and yes, Bars leaks would have sealed the imperfection.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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