I have no idea where it is and i want to shim mine. i ordered the shim kit and ive searched the site but cant find anything. Point me to a thread that already has the info i need. thanks in advance

Here's a couple of links for ya!

http://www.dieselbombers.com/06-07-lbz-bombs-aftermarket/17010-ppe-fuel-rail-shim-install-lbz-lly.html

http://duramaxdiesels.com/forum/showthread.php?t=267

hope this helps

JLew:)