Exhaust stud repair

[whiteyota]

Finishing up my motor rebuild, and I went to put the #1 exhaust manifold on. The studs were screwed in a little more than finger tight.
I didn't feel like there was any resistance when I installed them. Put the nuts on and went to torque to 29ft/lbs, and 2 of them won't take torque.
Is the best way to fix heli-coil?
Any tips or tricks you guys have would be appreciated, never done them before.
The picture is a bit grainy, and is the worst of the 2. The other still has all the threads.

 

[whiteyota]

second picture of what came off the stud

 

[Fj80oregon]

Look up timesert they are much stronger than a helicoil. https://www.amazon.com/TIME-SERT-Me...f543fb9a6317b5f036bd3b1&qid=1746562009&sr=8-4

 

[NeverFinis]

Personally, Heli Coil . 1/4 of the price of a Time Sert, and performs just as well.

Source

 

[reklund5]

using a time-sert is my preferred way to fix it.

 

[whiteyota]

Thanks for the replies and advice, I am gonna go with the time-sert.
I like that the time-sert is one solid piece vs. the coil. Yeah more expensive, but I believe what failed was an old helicoil.

 

[NeverFinis]

The picture shows to me aluminum threads.

IMHO, not a helicoil