for the LT1 owners out there, how do you tell if you spun a bearing

 

Lower than normal oil pressure is the most tell tale sign. You can also drain your oil, run your fingers through the oil while it's draining to see if you can feel and see metal flakes as well as cutting open the oil filter.
Why do you ask?

 

Makes a very unusual noise coming from the bottom of the engine. If you hear a video of someone who has one, its pretty obivious.

 

Mustang with a spun rod bearing.....
http://www.youtube.com/watch?v=q8qb0ur4e8A

LS1 with a spun bearing.....
http://www.n2s1.net/RacingVideos/havoc_enginesound.wmv

 

little to no oil pressure at idle, very odd sounds coming from the motor.

 

When I spun mine bout 10 years ago, got a loud ticking noise and oil pressure went to 0.

 

I spun a rod bearing with no apparent effect on oil pressure. The noise is the best indicator.