8.1 engine knock or something else?

[kljfamily]

2003 2500 suburban lt 8.1

The ongoing saga..

The oil line to the radiator blew and I loss all pressure(and oil all of it). Oil was everywhere!!!

The ecu shut down the car.

After fixing the line and replacing the oil it started up hesitantly at first but then came back to life..everything was fine..for about 2 miles then a small knock started happening. I turned around and headed home.

The engine starts and idles perfectly and is not overheating.

When you give it gas however at idle or in drive I can here the knock.

thoughts on where to start?

1. I've heard bad exhaust gasket or exhaust bolt could make similar noise.
2. heard bad cat could make similar sound?
3. pull valve covers and look at guides? What am I looking for?
4. Drop pan and look for shavings? Hopefully not a lower bearing?

Thanks for any advice.

I went and listed it for sale as a parts car. I was so done with it at the time but now rethinking it. I love that burb..well love hate...

I can post a video up if that would help