I called and spoke with both Zach and Ron, I purchased a prop and gave them the data from that trip which led us to change the amount of pitch and ended up lower than we originally thought, these props provide quite a substantial increase in stern lift over a similar aluminum prop, along with what seems like zero cavitation! The prop allowed my 5.7 to rev to the proper rpm and made the boat a real fun boat to drive, it pulls a tube amazing, cruises amazing, the boat rides better, handles better and is really just overall a better boat than when I started. Price wise this is the best money for dollar you can spend. I wasted hundreds on aluminum props thinking I could get close. I was very mislead about that. The guys here know their stuff, listen to them! Highly recommend, super fast shipping and extremely helpful!