[zakthor]

Originally Posted by garibaldi

yep, the muffler bearings hahah. I had a similar issue on my 77 911 turbo 3.0 I had pressure fed tensioners. For a few weeks id start the car and while it was waerming up, id hear this faint chain like grinding noise that would come and go. I chased my tail on it for ages trying to pinpoint it. turns out it was one of the tensioners check valve. It wasnt able to pump up all the way. None the less, there was a ton of grindings in my case. the filter had plenty of it too, you could just spread the pleats and see it in there. Point is , that that stuff obv gets pumped through the motor, and it can clog up your cam bars, wedge into passages, and if it gets sent into a bearing, it will jsut embedd itself in the babbit and make a new home. It can get ugly, and theres only one way to get it all out.

It sounds like exactly the same problem. How did your story end? You took the entire motor apart down to the crank bearings? That is a full rebuild?