Clevitte Main Bearings with slotted oil feed - Looking for PN

famous bob said

That is the oiling groove for the thrust sides , I`ve never seen a thrust bearing that didn`t have them, sbc, 426 hemis, 440`s -------------

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Not talking about the thrust face.

Oil supply hole, where is feeds from the block is normally a hole (like shown below). A mod to increase oil flow and time is to slot the feed hole.