This is exactly what we have learned over the last 20 years of building and blowing up Hemi's. 6-quarts is just not enough.....Oil pressure is king, but these also need a lot of volume.. Gots to have lots of it, and 10 quarts for us is the min we will run on even a mild one. Then there is all of the discussions around restricting the flow to the heads, priority oiling, push rod oiling, spray bar oiling, etc.....So many different variables, there isn't one right answer, but its what ever works for you. I have not been able to make a 7 quart pan work, mine are built to hold 12 typically.

And if it pegs the gauge when cold, so be it...I want to see +15psi at an idle hot in gear, and none of this fluttering stuff. I do not care what it is when cold. These engines are finicky with oiling, and frankly so much so, I do not always like owning them. I have never had oiling issues with a wedge. Then again, you can't fit 6 quarts of oil up in the heads like you can a Hemi..