The 340 is out....again.....

in the 340 era mopar drilled the holes in steps, to a max diameter of 1/4", so part of the hole may be less than 1/4". I have heard of a broken fluted end of a drill bit being left in there. all oil passages should be checked! federal mogul cam bearings : 1451m-.760" width center bearings, 1484m-.615" width center bearings. I save old catalogs-better than the interweb. Do not just install the wider bearings and hope and pray for success