I've got the LS1 tick
It just started doing it one day out of the blue. The sound is only evident under power. When decelerating, I can't really hear anything. It's consistent with the RPM of the motor, as in it has the same frequency through the gears. I really don't think it's an exhaust leak. I'm thinking more along the lines of the lifters or something in that area. Here's a brief (crappy) video where you can hear the sound:
http://www.youtube.com/watch?v=58fSb...ature=youtu.be
Any thoughts are appreciated! Thanks in advance, I'm glad to be a part of the site.

