[Alan Roehrich]

Darren, you'll have to measure the bearings, as they are installed in the block, and you'll need a really good dial bore gauge, such as a Sunnen, Starrett, or Mitutoyo, in order to do so. You can't just use a micrometer to measure the bearings to see how thick they are. The only thing that matters is their shape and size in the as installed position and condition.

The Federal Mogul is a fairly hard alloy bearing, and it is a 1/2 groove bearing set, as opposed to the full grooves in the Clevite bearings. I think the lack of the groove in the lower bearing shell may help to build a better film of oil, and hydrodynamic wedge, which may help keep the crank off of the bearings.