i have recently replaced the lower end new crank berrings lifters and oil pump i am getting a knock at low idle it sounds like lifters not pumped up so i replaced them and the oil pump still hearing the noise any sugestions

Is the noise on the top or bottom of the engine? Is it there all the time or just when you give it gas or just get off it? Does it sound anything like this?

its on the top end in the center at idle if u give it 100 rpm more it goes away

no it sounds like lifter tap

i did forget the harmonic balancer went bad

Balance shaft perhaps?

how do u tell if the balance shaft or berrings are bad

If bearings are bad your oil pressure will drop. Use a stethoscope to track it down. Could be a simple noisy injector.

lower berrings are new balance shaft berrings wernt changed noise is in the center top of engine only at idle

oil presure is 55 60