lifter galley crossover tube

Duane said
Yes I believe this is the post you are referring to B3.
I do not agree that the oil will always move to the low pressure area
And I do not agree that if the oil would move so fast that it cannot make the turn or there would be no oil pressure.
I posted earlier that my number 2&4 main bearings had lost bearing crush after 40 runs.
This engine had the Mopar tube kit in the block full grooved mains,
High volume/high pressure pump like my previous build before, with one exception. I had 75 pounds oil pressure easily.
I am reminded of an electrical question I once asked.
Why do transformers exist that have redo illusory high voltage. Eg. 600 volts. 2000 volts etc and the answer I was given is that voltage is the pressure. By the time we send the voltage through the wires to the next state or country. We hope to still have 240 volts when it gets to its destination or something to that effect.
We are taking our oil pressure readings at an area that is vary close to the output of the pump. That does not mean the pressure (remember the leakage) is the same at every point in the block.
What are the odds that those two cam journals just happen to coincide with the same two main bearings. Why did those bearings get hot. Why did the required volume of oil not get there.
Why can you not buy a new cam for an La engine that still has those grooves.

Let me get this straight. You pulled more oil away from the mains, to feed the heads, with a fully grooved 2 and 4 cam journal, and then the oil was flowing so fast, that it wouldn't turn into 2 and 4 oil galleys. Think about the logic of that. If the oil will no longer get there, what's the point of grooving the cam journals for increased oiling to the heads. What you did was create an additional low pressure area beyond the mains, and broke down the ability of the oil to maintain a hydrodynamic wedge. You can't blame oil velocity for that one.

The oiling mod for the rocker feeds does not turn a block into a priority main. Its been done a long time, and only serves to eliminate feeding the heads with main bearing oil. That main galley still has to feed at least eight lifter bores.