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stripped bolt hole dilemma

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need help, and im not sure on the uniqueness of my dilemma, and im not sure of the proper category.


i found a broken exhuast stud in my head (engine from the yard). in my absence of forethought, i drilled a hole and attempted to extract using an extractor. you know what, the extractor broke. so, i had a broken harden steel extractor in a broken steel stud in an aluminum head. i eventually grinded a hole with  dremel. it's about a1/4" diameter hole. 


now im certained with retapping the hole. what are my options? grind (because some hardened steel might b left) the hole out to tap for helicoil?


in retrospect, i should have welded something on and tried that. stupid of me.


any advice? thanks.


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