Manifold stud loose

Thanks (and I hope this valve cleaning worked!)

Are you sure you didn't strip the threads on the stud instead of the block?

I'm not a great fan of heli-coils in high temp situations, my Boeing Machinists used Klein-Serts which have little wedges that they drive in and stake the new thread bushing in place, they never come out.

But I think what I would do is see if I could find a 1/2 NC X 7/16 NF stepped stud. I know such things exist.

If'n unable to find a stepped stud, I would not hesitate to use some stud pucky, J-B Weld would also probably do..... ..Dell

If it has the brass nuts on the studs I would think it is more likely that the threads in the nut have stipped out. Put some good cadumium plated nuts on the studs. They won't strip and will be easier to remove the next time someone had to take the manifold off.

If the stud has actually turned in the block,I would remove it and try installing a new stud in the hole. If it still won't hold the best fix is a helicoil insert. The hole will have to be tapped out for the size of helocoil that will fit the new stud.

The manifold will have to be removed to install a helicoil.