I have a 66 c20 which I put a refurbished 350 crate motor in. Not a performance motor, just a bone stock 4 bolt main 350 with dual exhaust and a quadrajet. My stock oil pressure gauge reads from 0-60psi. I have about 5000 miles on the motor. Since day one, the oil pressure when on the freeway or any mid range rpm is over 60psi. At idle it is about 30psi or higher. I broke the motor in with 10-30, did my first oil change with 10-30, and my recent and last oil change I switched to 5-30. Seemed to make it a bit lower at idle but just the same at higher speeds/rpm. My question is...is that normal? To me that seems way high. I'm not sure what the truck originally came with as far as the motor, so I thought maybe I have an oil pressure gauge suited for an inline 6? Any help would be appreciated.
Thanks much.
