I don't think there is any significant difference in the overall volume of the Viper compared to the other modern F16's, this excludes the Taipan 4.9. There maybe some difference in the placing of it but even there is will not be alot.

I remember Greg Goodall stating several times at the GC 2007 that he learned that bow height was more important then actual bow volume. He also said that he didn't really understand it but that that was his experience. So the Viper has a tall bow but there is not much volume enclosed in the top so the overal bow volume shall not be significantly more then say the Falcon or Aussie Blade. (Can't comment on the Stealth as I lack measurements for that design). Take a look at a pic of the Viper from the front.

I think from looking over several pics of either that the Falcon has fuller bows; they are just lower. Actually, I feel the Viper bows resemble the VWM Blade F16 very closely if that design would have had a 0.50 mtr tall bow. Both have the same, almost triangular, bow deck.

Wouter