(pic) is this number on a LS3 the same on all LS3's?

[steve671]

Can anyone tell me for sure if this number that is stamped on the passengers side of the block, in front of the motor mount and behind the alternator (upper left of this photo), is an identifying number for this individual block, or is this same number stamped on all LS3's?
Thanks,

http://i110.photobucket.com/albums/n112/steve671/1969%20Camaro/IMG_0017-1.jpg