We had an oil pump pickup breakoff one time on the dyno. I didn't know it till I installed the motor and fired it. Had less than 10 psi, but it was steady. If you jabbed the throttle it just barely moved, and never went above 10psi. I quickly called the engine builder and he asked me how it acted, then instantly told me what had happened. We had only made 3 pulls as the engine was so killer there was no need. So I pulled the pan and looked over the bearings. They looked as a new one would look. Not even as much as a scratch in any of them. The last pull was to 7800 and it was the one with no oil pressure. The dyno operator was red faced as hell, but it was just a bob boo. No harm done except me getting greasy again. That last pull netted 4-5 more HP than the previous two. And BTW, that was the day I became a Amsoil Dominator Racing Oil believer. I ran it to this day.
On a side note, our Superstock engines had the Melling pumps gears cut down. They shorted them quite a bit so you didnt have as much gear contact. And they changed the springs around until there was only 50 psi. We run these to 9000 RPM.