Little problem here folks any advise would help. I have been restoring my car for going on 3 years now, and when i first started i had my small block built for me, not thinking it would sit for over a year before being fired up. But anyway When I first fired it up oil pressure seemed to be a little low but i wasn't alarmed, but just this week i finally got it on the road. When the motor gets to operatint temp. I have about 15 psi at idle still not alarmed. But when i rev it up the pressure drops, i doesn't climb with rpm. What could be my problem. Are my bearing clearances wrong, if they are there's not much i can do, like i said it was built for me almost 1 and a half years ago even though i only have 5 miles on the motor.Any advice will help.