Indy,
We're about to install a 545 ci 460 with a Canton #13-766 Drag race pan. I noticed on the dyno sheet (below), a similar
oil pressure drop from 72.6 PSI @4400 rpm to 66.8 PSI @6000 rpm. Certainly not as dramatic as Kaase's experience which went from 60 to 48 PSI but at much higher RPMs. I'm not sure I should be concerned since ~66 PSI at 6000 is very satisfactory.
What say you?
Elder