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Message: <blockquote data-quote="Skidz" data-source="post: 225376" data-attributes="member: 3920">Your speed sounds good for what your are running.  If you are at 5500 or so with the 3 blade 13 pitch prop, the 4 blade 15 pitch will pull your rpms way down.  You want to be running wot at or as close as you can get to max rpm's, which for this motor I am assuming is 5500.I would say the 2-2.5" above the keel that Pappy mentioned is about the max you can get away with.  The most important thing is maintaining adequate water flow.  The less lower unit in the water, the less resistance and more speed, but if you aren't getting good water to the engine, it's all for naught.  If it were me, I would start at 1" above the keel and work from there.  Maybe use a piece of wood as a spacer you need until you find that magic height.I am interested as to your set-up of the water pressure gauge; I also own a 25 Johnson, but the only place I could find to install one is on the tell-tale, which wouldn't tell me anymore than if I just glance back there and see it.HTH, Skidz</blockquote>