I just got the results back for my Gale Banks TT BBC from the dyno shop in Greeley Colorado. Actually, he left a message yesterday explaining that it didn't produce the 700 to 750 horspower I was excepting. That's because it made 853 HP at 5500 on pump gas! Naturally, I was stoked! After calling all my buddies with this wonderfull news, I headed down to pick it up. After a some chatting on a few issues, he handed me two dyno sheets. The first being the the one that was corrected to sea level showing the marvelous 853, and the second, at 4500 feet, showing a very dismal 667. WTF!! I couldn't believe the difference! He told me you lose around 25 percent at this elevation. I thought being force induction, that would take care of some of that difference. Any thoughts????????? Guess I'll just buy an impeller for the realistic horsepower and if anybody asks, I'll tell them "853 HORSEPOWER". LOL!