Right now my motor is 12.2 to 1. A guess would be somewhere in the 715 to 725 range.I've come to the conclusion that I would like to run on pump gas, 10.75 or so. If I can do the victors & stay close to where I am power wise, it's worth it to me. It seems that some of you guys have done this. I'm guess those heads will have to flow somewhere in the 380 range. Am I close?