I have a Shelby aluminum block and heads. My
oil pressure can easily go above 100 lbs cold and I am real careful until the temp comes up. Once the
oil gets warm it drops to 55 at 2000 rpm and 20 at idle, the max pressure hot is about 60. I spun the gear off the dist once cause I got carried away before it was warmed up but that was about five years ago. I have a high volume pump with
oil restrictors in the head a cast T pan and a Canton windage tray. If I hold above 4000 long enough, well over 100 mph, my pressure will start to bobble. I am convinced that I am pumping the oil up into the motor faster than it can return. The FE heads have a very challenging time trying to drain oil back to the pan and over use of silicon for the end seals can interfere with this. If you pull the dist and the rear breather you can see these drain backs with a mirror. I am always amazed at the number of people who think that a stronger oil pressure relief spring will help low oil pressure. It can make the high higher but the low will be unchanged.