We do not SPAM, nor do we sell, rent, or give your member information to ANY third party without your permission. You will receive our FREE weekly e-newsletter, which you may easily cancel at any time
Most of our content, boat tests and videos are available for free viewing. However, there is a small charge for access to archived videos and tests.
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
V-8
Displacement
5.7L / 350 CID
Bore & Stroke
4.00
Fuel
System
Multi-point Electronic Fuel Injection
Base
Engine Weight
948 lbs.
Length/Width/Height
43x 30x 22 in.
Max RPM@WOT
4600-5000 rpm
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-mounted starter and alternator.
MerCruiser® multiport fuel injection (MPI) system features high-quality marine-specific componentry for unmatched performance and increased throttle response.
MerCruiser® multiport fuel injection (MPI) system features high-quality marine-specific componentry for unmatched performance and increased throttle response.
MPI also provides dependable turn-key st
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 accessories.
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 greatly reduces the potential for vapor lock with
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)
Base Price
N/A
Max RPM@WOT
4600-5000 rpm
Propshaft HP
300-hp
Alternator Output Rating
65 amp/917 Watt
Dry Weight
948 lbs.
Fuel Type
Gasoline
Length/Width/Height(in)
43x 30x 22 in.
Fuel System
Multi-point Electronic Fuel Injection
Displacement (liters/cu.in)
5.7L / 350 CID
Ignition System
Crank-fired High Voltage Switchw/Knock Control
Cylinders/Configuration
V-8
Cooling System
Closed Cooling, Brass Sea Water Pump
Bore & Stroke
4.00
Exhaust System
Closed Cooled Iron Manifold w/Ceramic Coated Dry
Shaft Length
Electronic Engine Display
Aspiration
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