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Jax,

I am running a 90 E-Tec on my boat so not apples to apples with your situation, however it replaced a 1989 90 HP "Mercaha" that was very similar to the engine you have. The old motor was mounted all the way down on the transom and would turn a 19" Solas aluminum prop to about 5000 RPM (over 3 years ago at this point so my memory is fading on the specifics) and 40-41 GPS if I trimmed it out enough. The 13.25 X 15" Stiletto acts much more like a 17" pitch prop, in fact the other prop that was recommended here when I repowered was the BRP 17" Viper stainless. The Stiletto has relief holes in the hub that help with the hole shot, if you have a healthy engine and not too heavy a load it should be a good match. Mount it at least two holes up, most here will recommend three holes up. It's a great all around prop on a 16 / 17 with a 90 HP engine. I've seen 43 GPS at 5200 RPM light load on mine, I'd be surprised if you didn't see similar numbers with yours. Good luck.