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Toki also warned us about the oiling needs for '65 to '66 only 396 big-blocks. Oil to the rear main bearing cap passes around this slot in the rear journal on the cam. When replacing the stock cam, be sure to buy one with this groove or have the journal machined. Most cam bearings will have a slot machined into them, but you still need the slot in the cam to provide sufficient oil flow to the main bearing.