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I had a friend strip a cam cap thread on an EJ25 and he got the helicoil off using the existing hole. Was not a fun repair. I can't remember what insert I used to fix it but it was just big enough OD to work. The cam cap bolts on the EJ have a tapered shank so it was super important that it was perpendicular to the head. I have a tap guide block somewhere that I used to fix it.
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"Experience is the hardest kind of teacher. It gives you the test first and the lesson afterward." -Oscar Wilde.
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