I have not logged temp, but I'm sure its probably scalding. Normal low for me is 12psi. This is just the lowest I've seen and probably is from the high temps and thus the only reason I took a picture. According to dealers 6psi is the minimum so apparently they don't care about anything above that. The corvette boards recite roughly the same. It should be noted that mine is a rebuilt motor as well and I'm more interested in whats normal in case I want to take it to the shop I had it built at. Some say cam bearings could cause this as well as an oil pump.
I looked at other sites and they confirmed the use what ever oil weight that gets you 10 psi/1000 at 212 degrees reasoning.