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 at 4100 - 4200 rpm. So I'm thinking if I replace the stock two barrel with a four barrel, it should pick up the rpm back to 4700 - 4800 and put me into high 40's to low 50's in speed. I read in forums that a good carb-manifold is Edlebrock marine carb 1409 (600 cfm) or 1410 (750 cfm) with an idle to 5500 intake. Question one: Is the 1410 too much carb? Or no. Question two: When ordering the intake, what year engine do I say I have? Is it a Vortec? I've seen that the number of bolts holding the current one on is the difference, but my boat is in storage now....I don't know.
