Great point, this is often overlooked. I just had the same issue on my new little roller 318, changed the PCV valve, leak stopped.
If you run a HV oil pump, it even makes it more difficult on some of the sealing.
I'm also running a stock Oil pump but, with high oil pressure at 1000 rpm I'm running 45LB and at 3000rpm I'm up to 60 to 80lb. I have good oil pressure.
