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

CMcAllister said
I am. When the drilled passages line up with the passages in the block every revolution of the cam, how does that sudden large, albeit quick, leak effect the oil at the main bore, which also needs to maintain the hydrodynamic wedge at the main and two rods? And what is the timing of these events? I've never studied that - I just changed it - but I've talked to people who have. Do the cam manufacturers clock these passages any certain way?

Additionally, #1 & 4 cam bearings are being fed through large passages from the mains as well - two huge internal leaks. My experience is that much less oil is needed there to keep the cam bearings happy.

At 2500 RPM it's not an issue. At 7500 it may be.

The only experience that I have with that is I installed a cam that had the oil grooves in the 2&4 cam journals without a restrictor in the deck. Upon inspection of the main bearings #2&4 main had lost the spread and probably would have spun if left in there much longer. I can only surmise that this is why Chrysler had those passages timed. I recently bought a new roller cam from comp and discussed those grooves with them and they informed me that they no longer do this. Apparently some builders had rod bearing failures.
I changed the oiling to head as well to full time from the main galley
and restricted all 5 cam bearings.