Not by my measure.
And there is certainly a HUGE advantage of the 144 over the 136.... the 144 has SOLID RAILS, not 121" rails with extensions. I'm running an 03 with the 144 and am geared 23/42 with overdriven clutches. Top end is fine, but what's really amazing is how fast it gets there.
If you're looking for a 144" ripsaw, I've got one F/S (I'm looking for something better off trail).
Also, you've got to remember that the 144" rails are only 4" longer than the 136 - really not that much.