I miss spoke, there is not a groove on back side. It has enlongated holes that reach over to the oil jets from the groove on inside. Origial bearigs had offset holes that lined up with oil jets. IH felt by moving all holes to center in line with the groove they increased the bearing capacity. Later they went to a wider bearing also by changing the radi on the crankshaft journals, both mains and rods, except thrust main. Wider bearing will not fit older shafts.
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