I have a 99 Maxum 2300 SR with a 350 mercruiser. It currently has the factory two barrel on it. The boat came with a 19 pitch three blade alum prop running at 41-42 mph at 4800 rpm. I want more speed. So I bought a stainless Merc Vengence 21 pitch. After installing it, I can only get 35-37 mph...
