Turbocharger journal bearings are made from a soft material, the surfaces are the first to show damage. An inspection of the original bearings (two outer parts) showed no wear from dirty oil. See All ...

01. Our starting point is this clean ZZ4 GM Performance Parts 350-inch short-block. At some point someone swiped all the parts off of it and left it languishing in a corner. When it had all of its ...