Hows it goin, I recently rebuilt a 78 tahiti super tiger and installed a big block chevy I built for it, estimated around 500hp. I rebuilt the jet drive with an a impeller loader scoop with a place diverter and red insert cone. So far ive held it wide open for about 6 to 7 seconds and hit 63 MPH on a gps. I can spin the impeller to 5200 rpm constantly so my HP estimate is about right. The question is from your experience, how long should it take me, holding it wide open, to hit the max speed, and what should I be seeing for a max speed with this type of hull. Thanks.