They will most likely tell you to send it back. They have known about this issue for almost 2 years now since I first reported it. (According to them) Their claim at the time was “we’ve never seen this before”. Hard to believe after all these years making manifolds they could have this type of issue. I had two castings with this identical problem. Seems they would have recalled the unsold units and fixed them, but why do that when the customer can do their R&D for them? Another post above with threads not tapped?? WTF???
In all reality it’s easier to fix yourself than send it back.
