Thanks Mutt,
but i believe that they've been a lot of modification. I'm at an airport where there's a lot of 73/76's t/o and both types of a/c seems to lift off around the same area of rwy even though the B737 starts its t/o roll 500-600m longer. I've only seen the 737- 700 & 800 series. i cant make any comment on the 400 series.
Crotalo's answer seems to be right.....better check....
Cheers