My 351-W idles cold at 60 psi, 180 to 200 degrees idles at 30-35 psi with 15/40 Shell Rotella
oil. This is also at 700 rpm idle. Pressure goes to 50-55 psi at 1200 rpms hot and stays at about 55-60 psi above 2000 rpms. A number of engine builders said this is in the ball park and not to mess with it..... Also, stock
oil pump.... I have somewhere in the neighborhood of 15,000 miles on the engine with NO problems so far.
I would not worry about your engine with
oil pressure at 40 or above whether it is hot or cold.
Just my .02 cents.....
David