Quote Originally Posted by ronniejoe View Post
So, the answer to my question is no, you haven't repaired a 6.5 deck thread. OK. I guess it can't be done, then. I must have been dreaming, just like I dreamed about that boost compressor test data.
I have never repaired a 6.5 deck thread with a heli-coil, because I wouldn't. I've repaired plenty of others with them, and have seen a good number of failures. I may have been mistaken about full inserts, but the material thickness doesn't appear sufficient, at least in much of the block. More than one on a cylinder increases the odds of failure. Using studs changes a lot of that, which is what you say you are using. Using a coil insert and conventional head bolts is a recipe for failure, and I'll stand on that. I've seen it, and done it, on much lesser applications. Sometimes it worked. Sometimes it didn't.