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Ive pulled a helcoil and the thread holding in out of a rocker stud thread in an alloy cylinder head
Any ideas on how to fix it?
 

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There are a multitude of fixes dependent on your skill set, but in future try to be less heavy handed 馃槑
 

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Timesert or Keensert...also called key locking inserts......they are a thicker wall then helicoil thread repair insert similar to the idea of installing a pipe plug then drilling the center out of the plug and tapping that.

7/16 -14 thread in a thinwall key lock insert takes a 9/16-12 threaded hole, 7/16-14 thickwall insert takes a 5/8-11 tapped hole, 7/16-14
Pins get driven down to lock them in.
 

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If you just want it fixed, Drill that fucker out and thread in a new helicoil with locktite. Clean the hole good. Timserts insets are good but you have to get the angles right. With a helicoil I put a couple of other bolts in to 鈥榮ight鈥 off and you can drill it easy. Helicoil are my least favorite.
 

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If you just want it fixed, Drill that fucker out and thread in a new helicoil with locktite. Clean the hole good. Timserts insets are good but you have to get the angles right. With a helicoil I put a couple of other bolts in to 鈥榮ight鈥 off and you can drill it easy. Helicoil are my least favorite.
I just did this for a Holley bowl bolt in the main body. Gingerly drilled out the insert (and then picked out the remaining pieces), retapped and added a Helicoil with Locktite. As noted, there are better inserts.
 

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When repairing rocker stud holes, you can't go 'caveman' on it. The repaired hole has to be STRAIGHT with all the other studs! If you blindly drill/tap the hole, it WILL be crooked. This is best done on some sort of drill press with the rocker bosses leveled perfectly left/right and fore/aft.

Good Luck
 

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Holley bowl screws are 12-24.
The 12-24 part numbers are on this page:


My kit came with the .370 carbon steel inserts.
 
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