WARNING WARNING WARNING
I eventually had to replace my engine because of exactly this issue
Water will seep around the manifold studs and slowly erode the holes bigger and bigger as well as feed water into the manifold and cause no end of problems.
I tried a few things and it never worked for long. Helicoils = bad joke at best for getting a steel stud into an iron block. The slinky-spring things are by far the weakest part of the setup and come back out. Repair bushings are better IF done right. The local machine shop that did mine didn't do a good job and maybe didn't realize there was water on the other side. Two of them had water get around them eventually
I would take the engine out and have a GOOD machine shop do the repairs and make SURE it is all sealed water-tight. You also might look into brass nuts on the studs. They at least won't corrode onto the studs and refuse to ever come off again.
I eventually had to replace my engine because of exactly this issue
Water will seep around the manifold studs and slowly erode the holes bigger and bigger as well as feed water into the manifold and cause no end of problems.
I tried a few things and it never worked for long. Helicoils = bad joke at best for getting a steel stud into an iron block. The slinky-spring things are by far the weakest part of the setup and come back out. Repair bushings are better IF done right. The local machine shop that did mine didn't do a good job and maybe didn't realize there was water on the other side. Two of them had water get around them eventually
I would take the engine out and have a GOOD machine shop do the repairs and make SURE it is all sealed water-tight. You also might look into brass nuts on the studs. They at least won't corrode onto the studs and refuse to ever come off again.
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