A friend rebuilt a 250 Chevy and is wondering about what he thinks is low oil pressure at idle.The engine has new pistons,crank machined,all bearings replaced and so on.Him and an experienced mechanic friend assembled the engine.
With the engine fully warmed up with 10/30 oil the pressure at a 500 rpm idle is 20 psi.Running down the road is 45 psi.
I think the pressure is just fine.The slightly low pressure at idle is likely a bit excessive clearances on the bearings and or oil pump.
