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Go back to the Merc website and look at the Inboard section.
It shows the horizons with quite a few upgardes,
Three year warranty, top mounted starter, different oil pan, the inboard version has closed cooling standard not sure on the I/O version. I do know the inboard version has Titaniam Spark Plugs for longer service intervals sort of like the Cadillac NorthStar Engine. The Horizon Series was started for Inboard use. I didn't realize they offer a sterndrive version. Good question on your part!
VeeCat
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