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Here are some photos of the fixture I built to hone the aluminum lined insert bearing shells.
The fixture is bored .00015" below the maximum block housing bore specified by the bearing manufacturer. Note there are a split dowels, like I use on all the mains, to hold position between cap and block incorporated into the fixture.
The insert shown is either the center or front main insert. The rear main insert fills the entire fixture end to end. Note the radial oil delivery groove in the insert.