I hate to "be that guy" but sounds like wiped cam. How many pulls on the dyno? If less than about 12-15 then that is not enough time for the problem to rear its ugly head. Pull the covers and inspect the valves/rockers. A compression test might reveal a cylinder with abnormally high readings compared to the others as well. Also there should be some kind of valvetrain noise present but it could be very slight. Good luck. J.Rob
