My take on the oiling system crossover tube for the small block

Duane said

But those lifter bores with the chamfer are so close to the giant oil feed hole that as the bore accumulates some normal wear, and with so little surface area I would think they would leak more than a block without those chamfers. IMHO

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Maybe, maybe not. Fluid flow restrictors are made by using thin walled discs 90 degree to the flow direction. So the counter-theory is that the thin band on the lifter will act like such a flow restrictor. With fluid flow being what it is, and hard to guess, I would not bet on it being either way without testing. IMHO and all that...