When to worry about engine noises?

Kern Dog said
You really think that MILLIONS of small block Chevys that idled at 15 psi had zero oil pressure at the rods and rockers? They had idiot lights for oil pressure that tripped at 7-9 lbs.
I had a 305 in an '84 C-10 that went 369,000 miles on oil pressure just like this. No engine lives that long on zero oil pressure to the rods and mains.
The crank gets the oil first anyway.

Let's not compare a beat up old Chevy to a 408 stroker.
You think an engine producing 40 psi oil pressure will live at 6000 rpm.
Most high mile Mopar big blocks and small block produce at least 45 psi at rpm.
Run a performance engine with 40 psi at 5500- 6000 rpm's at the track on a regular basis and report back.
I'd like to know which part failed first, I have an idea.