Need these to estimate what you presently are doing
lower unit gear ratio
rpm with present prop
As far as what you can gain by raising the engine is a guess at best because many things come into play. Generally if the set up right you will pick up speed with raising the engine due to less drag. Only testing will tell. Pay close attention to cooling, slip in turns, rpm, handeling, speed at porposing.
There are other things to consider for greater speed besides raising the engine like trim angle, setback, weight distribution, etc.
Be safe wear a good life jacket and helmet if you presently do not.
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