When comparing flow numbers from different companies, you are not comparing apples to apples. It is well known in the industry that certain companies greatly inflate their flow numbers, while others are much more accurate. The ONLY way to evaluate flow numbers is if all the heads you are comparing are flowed on the same calibrated flow bench, bolted to the same fixture (bore size), and flowed by the same person at the same time.
Bottom line is, several dozen of our CNC'd stealth heads have been dyno'd on 500+ CI engines. They make in the area of 675-725 horsepower everytime like clockwork.
We will be the first to tell you, if you are looking for 750+ HP, these are not the heads for you. If you are looking for 700/725 HP or less, (generally in the 9 second range for most cars) then they will be a good option, as they have been proven without a doubt to be capable of these power levels.
Nice numbers, do you guys plan on offering a raised port/longer valve head anytime soon? Thanks
