Low oil pressure at idle. LH6 in an '08 Envoy

[astroracer]

Looking for some insight.
The engine has about 160K on it. It had oil pressure issues caused by a plugged screen at the sensor. Repaired that and had no issues until I did an AFM delete with a new PCM of NC cam, tune and headers.
After the cam change I drove it about 200 miles and the oil pressure started dropping. At driving RPMs as well as at an idle, where it will go to zero and the lifters start making noise. I am thinking a main bearing has left the building... Any thoughts? Experience?
Mark

[btmatt]

my son and i just replaced to oil pickup o-ring on his van with 6.0. cured all problems similar to what you noted above.

[astroracer]

Thanks for responding! Yes, I've been through that as well, the O-ring is fine.
Mark

[CamaroAJ]

I've seen a few oil pressure reliefs in the pump get stuck and will do that. Actually just did one last week because of it. On the LS the oil goes from the pump to the top of the engine. I'd lean more towards a pump or clogged pick up to start. Cam bearings also wear on a lot of the high mile engines.

[astroracer]

Put in a new pump with the cam kit. BUT... I got a new pump from PCM of NC and that one took a crap before I even drove the car... It may be a good idea to check this one... Thanks for the pointer...
Mark