www.iFourWinns.com

All of the disconnections to remove the engine can be done as a DIY project (preferably with a shop manual). I took my OMC engine out of my previous boat 3 time over the 18 years I had it.

That pricing does sound reasonable for engine rebuilding. I'm sure that doesn't include the manifolds, but in USA we can get the full set of manifolds and risers for a little over $600. If you want to increase your horsepower, the first thing to upgrade is the Camshaft. The second would be the Carburetor.

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"Knot Easy" 2000 Horizon 240 Volvo 5.7GS /SX
tow: 2017 Honda PILOT EXL-AWD
prev. boats:
'87 Chaparral 198CXL 4.3 OMC Cobra
'69 Jetstar 16ft Ski Boat, 115hp Yamaha
'68 Aluminum Jon Boat, 3hp Sears
'64 Water Wings

Hi Deafwish - What do you mean by upgrading to a 4BBL, is that the engine type,

a 4 barrel carburettor and matching intake.
Much better torque coming on to plane & more top end.
A cam upgrade would also be cheap & bring her to life!

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2011 Four Winns H180 SS.
Aussie built Mustang 2800.
SOLD - 1997 Four Winns Horizon RS

I have a Rochester Quadrajet on my little 4.3 and the surge of power when the secondaries open up is very noticeable. I would not want to have a 2bbl esp having the smaller V6 (6/8ths or 3/4ths of a 5.7)...

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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