lifter galley crossover tube
I "think" YR is not talking about the passages in the block. He's talking about the passages in the crank, feeding the rod bearings. What he's saying makes sense to me. If, and only if you are one who is running around at very high (for street and multi-use engines) rpms. The "average guy", and even most above average guys, will never need to worry about it. Use an engine and it wears. Use it harder and it wears faster. So bearings losing crush and rings losing tension are going to happen in the best of engines that are run hard often. That's why parts choices and machining quality become critical.