Welcome. I haven't noticed another 46 on the board...not many around, period. Anyway, there is one for sale on Yacht World...located in Duluth on Lake Superior. You might e-mail the broker and see if he has any information...bet the owner would be happy to help you. Another possibility is to ask Ocean Alexander if they have a prop curve for the boat with that engine. The Seattle dealer/yard is quite helpful with inquiries. Or perhaps Caterpillar has one for the engine.