Mercury Mercruiser engines

Gas Sterndrive 350 MAG MPI Horizon 300 hp

It’s amazing how much performance you can pack into a small-block V-8. The 350 Mag MPI Horizon™ is the perfect example. All the maintenance-saving technology of a Horizon engine, all the craftsmanship of MerCruiser® and something you wouldn’t expect from a small-block V-8—300 horsepower. Boating Benefits 3-year extended maintenance interval (except for periodic fluid-level checks and seasonal oil and filter changes). 3 years of factory-backed product protection–standard (includes standard 1-year warranty plus 2 years of extended Mercury Product Protection through the Mercury factory-administered program). 3-year warranty against corrosion failure. Closed-cooling with 5-year coolant. Exclusive quick oil drain system that eliminates the need for a pump, simplifying routine maintenance. Ceramic-coated exhaust elbows and manifolds for outstanding corrosion resistance. Multipoint manual water drain system, which makes winterizing easy. Exclusive remote oil filter located atop the engine, simplifying routine maintenance. Exclusive drive lube monitor conveniently located atop the engine for easy access. Compact hydraulic steering available for pontoon applications, which is offered as a factory-installed option on the Alpha drive packages. Exclusive Mercury MerCruiser® service dealer network.

350 MAG MPI Horizon 300 hp Specifications

Propshaft Horsepower:		300 (224 kW)
Displacement (Litre/CID):		5.7/350
Cylinders:		V-8
Bore & Stroke(in/mm):		4.00 x 4.38/101 x 111
Compression Ratio:		9.4:1
Fuel System:		MPI
Full Throttle RPM Range:		4600-5000
Ignition Type:		Digital
Alternator (amps/watts):		65 amp
Length (in/cm):		37/94
Width (in/cm):		29/74
Height (in/cm):		22/56
Weight (lbs/kg) - Alpha:		952/432
Weight (lbs/kg) - Bravo One:		1025/465
Weight (lbs/kg) - Bravo Two:		1037/471
Weight (lbs/kg) - Bravo Three:		1046/475
Transmission Ratios
Gear Ratio - Alpha Drive (primary/optional/high altitude)		1.47/-/1.62
Gear Ratio - Bravo One (primary/optional/high altitude)		1.5/1.36/1.65
Gear Ratio - Bravo Two (primary/optional/high altitude)		2.0/1.81/2.2
Gear Ratio - Bravo Three (primary/optional/high altitude)		2.0/1.81/2.2

Standard Features Audio warning system Closed-cooling Constant-tension hose clamps Ceramic-, EDP- coated and painted exhaust elbows Ceramic- and paint-coated exhaust manifolds High-temperature spark plug wires Knock-control sensor MerCathode® Platinum-tipped spark plugs Power steering Easy engine oil drain system Remote oil filter Serpentine belt 90 mm throttle body Water-cooled fuel system Multiple blue hand-removable drain plugs located on port, starboard and front of engine Water/fuel separator Engine flush port Seawater pump material - composite Optional Features Compact hydraulic steering 3" risers Drive available on Bravo One Bravo Two Bravo Three Alpha

Visit our other Mercury Marine Equipment

Gas Sterndrives

850 hp - HP900 SC   /   550 hp - HP 575 SCi   /   470 hp - HP500 Bulldog
470 hp - HP500 EFI   /   425 hp - 496 MAG HO   /   375 hp - 496 MAG
350 hp - Scorpion 377   /   320 hp - MX 6.2 MPI Horizon   /   320 hp - MX 6.2 MPI
300 hp - 350 MAG MPI Horizon   /   300 hp - 350 MAG MPI

Drive Options

Dry-Sump Six   /   Bravo One XR   /   Bravo One XZ
Bravo One   /   Bravo Two   /   Bravo Three   /   Alpha

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