I have a 1973 19-6 Aquasport and have removed the 83 150 crossflow in favor for a 1989 120 v4 looper. I had a 17 pitch viper on the crossflow and it ran 5400 rpm wot at 44 mph It never was able to get to 5800 <br /><br />I need a starting point for the 120 as it is now a 2.00 to 1 gearcase and I have no Idea where to start.
