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I have a rocker arm in my '03 Century Custom that has stripped out the head. I tried to tap it and helicoil it but unfortunately the tap went sideways. I am thinking that I may be able to drill and tap it out to a larger size. My question is, can I tap this out to a larger size and use an m10 1.25 helicoil with an m8 1.25 helicoil. If not, is there a way for me to do this.

  • Try something like an EZ-Lock. The insert is solid and larger than an Helicoil. As long as you drill straight and there's enough meat left in the boss, it should be just peachy. – Pᴀᴜʟsᴛᴇʀ2 Mar 29 '17 at 1:06
  • One option is to use a keysert, as shown in this question. – Zaid Mar 29 '17 at 2:09
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I don't know how you held the tap or drill for your first effort, but you should use a drill press and mount the head such that the boss you need to work on is perpendicular so that whatever insert you plan to fit goes in correctly this time.

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