The general term for this type of bearing is "semi-finished". Back when crankshaft grinding equipment was not as accurate or repeatable as today's high-precision machines, bearings had to be custom-fitted by boring and/or hand-scraping to get an acceptable fit and clearance. Another advantage to semi finished bearings was that a reground crankshaft could use the same bearing set as a standard-diameter one- - - -just bore the bearings to a smaller diameter. Cam bearings were also supplied as semi-finished for some engines.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!