Standard process available to re-thread with heli-coils or similar devices. I would leave it to a professional to fix if you wish to save the head.
I've had center blow out of a plug on a boat motor, never a car.
I presume it blew 'cause it wasn't in properly, if not you will have to investigate cause.
98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both
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