I have braised/welded many of them and drilled/tapped and inserted a lock bolt in many others.
The area in question is a pressure fit and is not trusted by hotrodders! I have never seen them come apart but have heard stories of dragsters going dry from dropping a pickup.
So I always take some measures to make my head feel better... the factory simply presses them on there and they seem to last forever.
Once more... take the pcv off and clean out the hose and go get a new one... Then take the back hose off and do the same.
On Wranglers with similiar blowby I put both hoses to a vac source.. So far it has stoped all blowby leaking problems.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />