I have a LS2 in a sand rail and on my last trip it started making a high pitch sound like metal to metal down by the harmonic balancer. This is a create motor with almost no time on it. I pulled all the belts and noise is still there only when motor get warmed up. When motor is cold at startup it has 38PSI of pressure and takes 20 minutes to get warmed up enough for the sound to come back and oil pressure is at 28PSI at idle. The noise is definitely coming from behind the balancer and it does get faster as RPM go up. The motor does not drag when it turns over hot or cold. What’s my next step?

 

Cut open filter & look for metal from bearings. Also, check for chips in oil pan

 

Have video/audio of the noise?