Tony this is a Herc not a GM motor.They have a small pump and not much screen area.
But I do understand....Anyone that's still using H.D. oil might have some kindda hard time understanding good advice....Bet you believe in Plastigauge and Bonne Ami
Seriously you might have a loose or cracked pickup
tube but I'd bet it's the screen
If my Diamond T was doing that I'd pull the pan