lifter galley crossover tube

Duane said

I work at a Chevy engine plant for a living. The new Chevy small block oiling system has been extensively revised from the original design. Heck they do not even drive the oil pump the same way any more. The two oil galleys are now in a closed loop at both ends of the block. There are eyebrow cuts in the main block saddles now with two bearing feed holes to fix the volume and timing issues.
The original Chevy had its room for improvement too.

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Don't get off the reservation. You can drive the pump any way you want, you can move the galleries anywhere you want, as long as the oil feed hole in the block lines up with the rod feed hole in the crank lines up at about 70 degrees past TDC.

The engineering is settled. If you don't want to turn RPM and drive tractor engines it doesn't matter.

If you lost the number 2&4 mains it want because the cam had a groove in it. You can't increase the leak by a groove. The leak control is at the rockers.