Some of you may have experienced this problem or possibly heard rumors. This is first hand experience. I had my 401 rebuilt by a reputable shop. 2500 miles later the engine was trashed. It appears, engine is not completely torn down, that the pistons have "black death", cylinders are scored, cam shot, and what elese I do not know at this time. It APPEARS that the culprit is Federal Mogul rod bearings. They do not have the half moon oil hole in them opposite of the centering tab. Second hand info from a shop in Texas indicates that the hole was eliminated about 2 1/2 years ago. Federal Mogul indicated to the builder that the hole is no longer needed in MODERN engines. The hole is necessary to lube the pistons, cylinders, and cam. The gentelman in Texas said he called Clevite and asked about the oil hole, as Federal Mogul indicated that everyone was eliminating the hole, and they indicated that their bearings still had the hole and it was absolutely necessary. He recommended the Clevite 77 or the Michigan 77 bearing and never use Federal Mogul in the AMC 360/401. If you are aware of the problem and/or have info on it please email me.