I figured they had more lift as well as longer duration. Ok, I'll plug 0.264" in it when I get home tonight, probally 6pm or so. I'm also going to go down a step from 'race headers' because I'm not sure exactly what it's classifying those as.
Maybe I'll figure out how to raise the dyno cutoff point -above- 11k RPMs, but I'm not holding my breath.