I had less than 5.0 inches on my 505 C.I. race motor in my S/P Cuda with an enhanced GZ vacuum pump in neutral at 1000 RPM up to 5000 RPM confused
The next race motor will have a four vane Moroso, or dry sump oil system. I'm hoping for 12.0+ inches revved up above 5000 RPM luck

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)