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if it actually blew out as in was ejected from the plug hole then you will need to use a heli-coil or time-sert
 
Yeah dont use a heli coil it will just blow out again, mac tools makes a nice kit
 
On my old engine. I had a spark plug blow out due to nitrous. I had a heli-coil installed and that lasted for about 3 yrs before I had my new engine installed. I still sprayed nitrous while having the heli-coil.
 
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