to replace a stripped head bolt, you will need to remove the head. very carefully you willneed to drill out the bolt hole in the head. you can then retap a thread into the new hole and use a larger headbolt, or you can use a speedythread to replace the thread to the original size.if you are not mecahanical i would have a mechanic do this. do not let them tell you that it cannot be fixed,or you will be replacing the motor or the engine block.
Use a bolt extractor. It is not recommended to reuse the head bolts, that is why they are designed to not fit a 12mm or a 13mm.
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