I'm sure different engines and pumps have different prv setpoints. I know my 5.0/347
oil pressure holds steady at 60 psi at idle cold and drops to 40 psi hot. I have never seen it go above 60 psi hot or cold at any rpm. The pressure is proportional to rpm until it hits 60 psi. I would guess that the prv is higher than 60 psi since the
oil pressure sending unit is a fair ways down stream of the pump, but I am fairly certain that the prv is limitting the pressure. I have ran both 10w-30w and 10w-40w. The 10w-30w was more like 50 psi at a cold idle. I have thought about going back to the lighter
oil to take load off the distributor gear, but I like the heavier oil for the cast pistons.