www.iFourWinns.com

Horizon 200.

Anyone done this ? Are you happy with the results ?

What it will give you is more power at higher rpms, lets say after the boat gets up on plane, accelerating from 3500-4500 rpm. Lower speeds you won't see a difference. Keep in mind the full cost:
carb
4 bbl manifold
any fuel lines/linkage changes you have to make

I have a 4bbl Quadrajet on my 4.3 and it performs well. The Quadrajet is a spread bore 4bbl with small primaries for very good fuel economy and huge secondaries for great high rpm response. According to OMC the 2bbl was rated at 175 and the 4bbl was rated at 205 hp. So its 30 hp. However, if you never go over above 4000 rpm you won't feel a difference.

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

If you are interested in EFI, check out Holley Sniper EFI kit (marine version). Not sure what you're willing to spend because its going to be more than a carb and more than just bolt on. They also have capability to do electronic timing. I have been researching for a car and lots of positive reviews for these kits. They seem as basic as you can get going electronic and not terribly complicated to install.

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--2002 3880 Regal Flybridge | Twin Merc 8.1HO **Seven**
--2003 AB 13 VST Console Inflatable | Tohatsu 40hp TLDI **Phish'n ski**
--310 Mercury Inflatable | 1982 9.9 Johnson

If you have a Holley 2bbl on the VP its fairly easy to install a Holley 4160 or even a 4175 spread bore 4bbl. The 4160 is a square bore carb and requires an adapter to work on the spread bore 4bbl intake that is commonly available. The 4175 is a spread bore carb so no adapter needed. Adding EFI sounds great but if you run into troubles do you have any local support for the Holley EFI system? I'd ask around before investing in it. Most any hot rod shop will know people who can work on Holley carbs, they are about the most common carb in the aftermarket that there is, followed by the Edelbrock.

https://www.holley.com/products/fuel_sy ... ts/0-80552

V/P used these on their 4bbl V8s.

First see what manifold your engine has, some have a standard 2bbl intake, some use a 4bbl with an adapter for the 2bbl carb. Then, you have to see if the 4bbl mounting is for a square bore or a spread bore. If its a square bore you can use the Holley 4160 or the Edelbrock, Holley would be easier because the throttle hook up is probably the same as the 2bbl. If its a spread bore intake, then you can use the 4160 with an adapter or the spread bore 4175.

_________________
88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II