Low oil pressure after warm up

I just had my 460 freshened up. New rings and bearing micro polish the crank. Well its 65 psi at cold start and stays that high till after I make a pass then at idle the pressure drops to 25psi. Using 20/50 Valvoline zr1. Before the freshening it wouldn't drop below 40 psi. Should I be concerned? It goes back up to 60psi as soon as I bring the rpm up above 900

airford1 wrote:I just had my 460 freshened up. New rings and bearing micro polish the crank. Well its 65 psi at cold start and stays that high till after I make a pass then at idle the pressure drops to 25psi. Using 20/50 Valvoline zr1. Before the freshening it wouldn't drop below 40 psi. Should I be concerned? It goes back up to 60psi as soon as I bring the rpm up above 900

The engine clearances or oil pump probably have something different than before the "freshen-up".
I don't see any problem with 25 pounds oil pressure at idle.

Kind of my thought Thanks randy.

pressures sound good to me ! send it!
Frank

Might be cam bearing clearance, but certainly not something to worry about.

As long as the pressure goes up at RPM you are good . No "reason" to have 40 or more at idle. 25 is fine as others have already said.

thanks guys

Lifters in backwards. Tie bars to the inside!

away wrote:Lifters in backwards.  Tie bars to the inside!

Funny guy, that has to be it.