From Cervelo 2004 - http://web.archive.org/web/200402141224 ... anual.html
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2. Seatpost Length:
The seatpost has a relatively limited adjustment range in and out of the seat tube due to the design of the bike. In some cases, this may require you to cut down the seatpost to fit it to the rider. This is not a problem as long as a minimum of 65mm (2.5") of seatpost remains in the frame
(Figure 1). The seatpost can be cut down with a hacksaw. In other cases, a longer seatpost may be required; longer seatposts are available from Cervélo.
The reversible head seatpost did come in various lengths and also was used on the Soloist, Dual and P2K to name a few, so you should still be able to find a longer post...
How long is your seatpost?