Dave,

My truck actually did the best on level 9, but I remember you telling me that you have seen many trucks do better on a lower level. Mine was an ETC though, so that probably made the difference. I personally find it hard to believe that you are air limited at 490. Dad made 490 a few weeks ago with his on a 248c with just a single HX-40, and the guys Don mentioned made a little over 500, so your twins should be good for more than that. After all, you made 550? on the drag truck? The ETC VP44 has been proven by many that it's good for a ~750hp limit, and I have a hard time believing that a 1/2 mm smaller plunger will cut that limit by 250hp. There a several HOs around here, and they make more than a 78 hp gain off their boxes.

John