In article ,
says...

does anyone here have good data on the specifications of falcon 9?

i am looking specifically for empty mass / fuel mass for both stages ..

Since SpaceX is a private company, short of signing a nondisclosure
agreement and talking to the SpaceX engineers, the best information
you're going to find is on their website.

FALCON HEAVY OVERVIEW
http://www.spacex.com/falcon_heavy.php

From above:

Anticipating potential astronaut transport needs, Falcon Heavy
is also designed to meet NASA human rating standards. Falcon
Heavy is designed to higher structural safety margins of 40%
above flight loads, rather than the 25% level of other rockets,
and triple redundant avionics. Despite being designed to higher
structural margins than other rockets, the Falcon Heavy side
booster stages have a mass ratio (full vs. empty) above 30,
better than any launcher in history. By comparison, the
Delta IV side boosters have a mass ratio of about 10.

Jeff
--
" Solids are a branch of fireworks, not rocketry. :-) :-) ", Henry
Spencer 1/28/2011