Been doing a bunch of research on threaded inserts since the one that was installed with the rebuild already pulled out leaving a 5/8" hole. There are only a couple options for fixing an already "fixed" hole. Big-sert (made by Time-sert) and E-Z LOC.
Okay, lets check this before I do something stupid. My buddy was able to get me some of the thick wall versions of the E-Z LOK inserts. They use a 7/8-9 external thread versus the standard version 3/4-10 thread. Being .125 larger, I am very concerned about the material that is on the water port side of the hole.
From the edge of the thread to the edge of the water port, it is only .125 wide. Is this enough material to not cause a crack or breakage? Should I go with the 3/4" external thread version, which will give me .0625 more material? Here's a couple pics.
It looks bigger but it measures .125
The rest seems okay
This is what I removed that had pulled out
