Small block oil pressure problem

Hey!

I am new to this forum and glad to be here. Got a .040 over 350 SBC. Everything is brand new. Pistons, rings, bearings, etc, etc. I plastigauged all of the rod and main bearings. The crank was new and .010 under with a matching set of bearings. Everything was within specs.

The motor runs very strong. When I first start the motor, the oil pressure is around 60 psi at idle. Then I drive the car and it warms up and then the oil pressure drops to around 25 psi. And along with the pressure drop I get a lot of valve train noise from both banks and it is pissing me off to no end ! I gave the valves a second adjustment and the problem still exists. It sounds like an oil pressure problem to me. The filter is a FRAM and the oil is Castrol GTX 10-30. Looking for some advice here. Thanks in advance.

John from NC

What oil pump??? or maybe the relief spring is weak or bad???? New cam bearings on the build too????

New Melling oil pump and new cam bearings too

whats the oil clearance on main and rods ? what pump stock ? spec is 001.5 to 003. on rods and about the same on mains.what brand of bearings? .i will tell you if your past 2.5 on the rods and mains with a stock pump she will be low .but valve train should not be making noise did you drill the lifter galley plugs with a030 drill

By any remote chance.... Did you put screw in oil restrictors in the lifter supply rails in the rear of the block?