MerCruiser
350 Mag MPI Horizon (300-hp)

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350 Mag MPI Horizon (300-hp)
The 350 Mag MPI Horizon packs a lot of performance into a small-block V-8. 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.

Fast Facts
Propshaft HP	300-hp
Configuration	V8
Displacement	5.7L / 350 CID
Bore & Stroke	4.00
Fuel System	Multi-point Electronic Fuel Injection
Base Engine Weight	948 lbs.
Length/Width/Height	43 x 30x 22
Max RPM@WOT	4600-5000

Key Features

Standard Horizon features also include a roller cam valve train, high-temperature spark plug wires, stainless steel ground studs, along with a high-mo
MerCruiser® multiport fuel injection (MPI) system features high-quality marine-specific componentry for unmatched performance and increased throttle r
MerCruiser® multiport fuel injection (MPI) system features high-quality marine-specific componentry for unmatched performance and increased throttle r
Platinum-tipped spark plugs for extended life and reduced routine maintenance.
A one-piece serpentine belt means easier servicing, less maintenance, unsurpassed belt life, and requires fewer horsepower to drive the engine accesso
A 65-amp alternator with more power to handle additional accessories. The alternator is high on the engine block to avoid water contamination.
MerCruiser water-cooled and insulated fuel system, which eliminates the need for a return line to the fuel tank, helps keep fuel temperatures down and
Remote mounted oil filter places the oil filter within easy reach for simple, clean oil changes.
Brass Sea Water pump housing improves life and better resists damage from running dry

MerCruiser 350 Mag MPI Horizon (300-hp)
Propshaft HP	300-hp
Max RPM@WOT	4600-5000
Dry Weight	948 lbs.
Length/Width/Height(in)	43 x 30x 22
Displacement (liters/cu.in)	5.7L / 350 CID
Cylinders/Configuration	V8
Bore & Stroke	4.00
Alternator Output Rating	65 amp
Fuel Type	Gasoline
Fuel System	Multi-point Electronic Fuel Injection
Exhaust System	Closed Cooled Iron Manifold w/Ceramic Coated Dry
Ignition System	Crank-fired High Voltage Switch w/ Knock Control
Cooling System	Closed Cooling, Brass Sea Water Pump


MerCruiser 350 Mag MPI Horizon (300-hp) Multiport Injection (MPI) inboard models are now available with optional Digital Throttle and Shift (DTS). DTS eliminates all helm maintenance and provides silky-smooth shifts for the life of the prod

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Key Features

MerCruiser 350 Mag MPI Horizon (300-hp)