Oil pump shim

[slowpoke]

just fired it up after it letting it cool and same thing started, if i let it idle at 600 rpm pressure actually comes up to 38psi, increase idle to 850 pressure starts to drop down weird. Well i guess i'll wait till i go down the road and see what happens when it gets heated up, just don't know what else can dump oil pressure then return to normal. If pressure is good going down the road then i'm going to try a thinner synthetic, maybe.