Got a 350 Malibu 1980. Motor was rebuilt with all new parts that fell within specifications. Oil clearances were where they were supposed to be (plastigauge). Motor runs very strong, but oil pressure drops to around 25 psi at idle when fully warmed up. Initial start pressure is right at around 60 psi. Along with the pressure drop I am getting valve train noise from BOTH banks and it is really pissing me off! Sounds like an oil pressure problem to me. Running a Fram filter and Castrol gtx 10-30. Looking for advice. Thank you in advance.

John from NC