B767 CAPT REPORTS TKOF WITH DATA FOR 270K GW WHILE ACFT ACTUALLY WEIGHS 370K.

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ALL NORMAL PRE-DEP DUTIES HAD BEEN COMPLETED AND THE FO WAS THE PF. ON TKOF ROLL I CALLED V1; ROTATE; V2. AS THE FO BEGAN ROTATION I SENSED THAT THE ACFT WAS NOT YET READY TO FLY AS EVIDENCED BY AN INCREASE IN PITCH YET NO LIFT-OFF. AS WE APCHED 9-10 DEGS OF PITCH AND COULD TELL THAT HE WAS STILL TRYING TO PULL THE ACFT OFF THE GND I PLACED MY HANDS ON THE CTL WHEEL AND SAID HOLD TAKE IT EASY. ABOUT A 1-2 SECOND DELAY HOLDING 9 DEGS OF PITCH THE ACFT DID LIFT OFF. THIS WAS APPROX 15 KTS ABOVE OUR V1 SPD. I HELD IT THERE UNTIL WE HAD ACCELERATED ANOTHER 15-20 KTS THEN STATED TO CONTINUE THE CLB. IT WAS THEN THAT I RECHK THE SPD CARD. TO MY SURPRISE AND I HAD NOT CAUGHT IT BEFORE DUE TO THE SPD BRAKE HANDLE BLOCKING THE FIRST DIGIT OF THE WT THAT WE HAD THE WRONG CARD SELECTED. WE HAD SET THE SPDS FOR A TKOF WT OF 270000 LBS INSTEAD OF 370000 LBS. I STATED TO HIM TO ADD 20 KTS TO ALL RETRACT SPDS. CLEANUP WAS COMPLETED WITHOUT ANY OTHER PROBS. UPON FURTHER DISCUSSION THE FO STATED HE OPENED THE SPD CARD AFTER WE HAD GOTTEN THE WT AND BAL BUT MADE AN ERROR. I LOOKED AT THE CARD WHEN WE SET THE SPDS BUT THE SPD BRAKE HANDLE HAD BLOCKED MY VIEW OF THE 2 IN 270000. IN THE FUTURE I THINK THAT VERIFYING THE SPD HOLDING THE CARD IN YOUR HAND INSTEAD OF PLACING IT OVER THE FMC WOULD HAVE ELIMINATED THE MISTAKE. FORTUNATELY THERE WAS NO ACFT DAMAGE. WE DISCUSSED DIFFERENT TECHNIQUES TO USE FOR ENSURING THAT THIS TYPE OF EVENT NEVER OCCURS AGAIN.