I had clevite bearings installed on my block just fine, however Im not sure if this is due to the machine shop having to pop them in and pop them back out, but the main bearing towards the flywheel side was too "thick" not allowing the crank to turn easy, so I just machined off like a hair on the side, not the race. I think this may have happened from the factory or when the machine took the bearing back out they may have struck it too hard on the side causing it to widen a bit.