Mercury Mercruiser Engines

Marine Inboard 6.2 Horizon - 320 hp

The Horizon 6.2 features standard closed cooling and a four-year factory warranty when installed by one of our many Installation Quality-certified boat manufacturers. Producing 320 hp from its custom-built small block architecture, it makes a great choice for boats that need a little extra torque to get on plane or for owners just looking for that perfect combination of light weight and power. Fitted with our Multiport Injection (MPI) and advanced engine control systems, the Horizon 6.2 is the pinnacle of gas inboards. Like all MerCruiser inboards, the Horizon 6.2 is available with a large variety of popular transmissions to fit virtually any application. Available DTS (Digital Throttle & Shift) is mated to a direct-acting electric shift transmission. DTS eliminates cable maintenance and provides consistent and precise throttle and shift control and never requires any adjustment. DTS can automatically synchronize multiple engines, provides shift protection and includes SmartStart digital starting. DTS also features Transmission Guardian to automatically protect against damage from overheating or low fluid levels.

   Mercury Mercruiser Marine Engines Inboard 6.2 Horizon - 320 hp


  • ECM 555 fuel and ignition system along with platinum-tipped spark plugs ensure reliable starts and outstanding performance, year after year
  • Dry-joint exhaust eliminates the chance for water to enter engine through leaky gaskets
  • Cartridge-type water-separating fuel filter helps protect fuel system and engine against damage
  • Industry-exclusive 3-year limited corrosion failure warranty
  • High-mount starter and plastisol® oil pan are protected from salt water for years of reliable operation
  • EDP-coated exhaust elbows resist temperature and corrosion for long life
  • Horizon models feature closed cooling that includes exhaust manifolds for added corrosion resistance
  • Brass Sea Water pump housing improves life and better resists damage from running dry


  • MerCruiser’s exclusive custom-built 6.2-liter small block engine features a long-stroke 4340 crankshaft and custom ground cam for superb big-boat power in a lightweight package.
  • Two-piece, long-runner intake manifold design improves low and mid-range torque for better acceleration and handling heavy loads
  • HVS Ignition with knock control maximizes power and protects against low quality fuels
  • Low restriction flame arrestor for added horsepower and torque
  • Variety of available high quality hydraulic transmissions and gear ratios allow boat manufacturers to precisely match hull characteristics and boat weight to optimize performance.


  • 3-year/300 hour maintenance interval on many periodic service items saves time and money
  • Convenient remote oil filter location makes oil changes cleaner and makes periodic service simple and less work
  • Color-coded service points makes checking fluid levels simple and straightforward
  • Operates on easy to find, less expensive 87 octane fuel
  • Long-life anti-freeze only requires replacement every 5 years
  • Single point air-actuated water drain system standard on Horizon and optional on other models
  • Dual dipsticks for easy service access


  • Optional DTS provides unparalleled control system technology to insure years of maintenance-free and reliable shifts and silky-smooth throttle control. Automatic engine synchronization, electric shift control and running start protection make this option a must for larger yachts
  • Exclusive Transmission Guardian monitors temperature and clutch pack pressure and protects transmission from damage due to overheating or clutch slippage due to low hydraulic fluid pressure (DTS Only)
  • Large 65 Amp alternator provides plenty of power for popular onboard electronics
  • MPI engines are designed to display engine information on your choice of analog or SmartCraft digitally-driven gages and displays.

Power 320HP (235 kW)
Full Throttle Range 4600 - 5000 RPM
Displacement 377 CID (6.2L)
Engine Type V8
Bore & Stroke 4.00" X 3.75" (101mm X 95mm)
Compression Ratio 9.0:1
Fuel Requirement 87 Octane (R+M)/2
Engine Control System ECM 555 with SmartCraft CAN Capability (PCM 555 w/DTS)
Fuel Delivery System Gen III Cool Fuel
Fuel Injection System Multi-Point Electronic Fuel Injection (Sequential Fuel Injection w/DTS)
Induction System 2-piece Long Runner intake with 75mm Throttle Body (80mm w/DTS)
Ignition System Crank-fired High Voltage Switch w/Knock Control and Platinum Plugs
Charging System 65 Amp/917 Watt Alternator
Water Drain System Single Point Air-Actuated
Exhaust System Closed Cooled Iron Manifold with Ceramic Coated Dry-joint Exhaust Elbow
Cooling System Closed Cooling, Long Life 5-Year Anti-Freeze, Brass Sea Water Pump
Accessory Drive System Serpentine Belt
Recommended Engine Oil Mercury MerCruiser Full-Synthetic Engine Oil, 20W-40, NMMC FC-W rated
Engine Guardian System Low Oil Pressure, High Coolant Temperature, Transmission Temperature, Low Sea Water Pressure, Low Voltage, Over-rev control, Knock Control
Dimensions (LxWxH) in 43 x 30 x 22
Dimensions (LxWxH) mm 1092 x 740 x 559
Digital Throttle & Shift Standard
ZF 63A (Available w/DTS) 1.5, 2.0, 2.5, 2.7:1
ZF 63 IV (Available w/DTS) 1.5, 2.0, 2.5:1
Weight (lbs./kg) 948/431
Full Closed Cooling System Standard

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Bullock Marine offers new & used powerboats as well as performance boat accessories: skater, fountain, eliminator, Mercruiser Mercury Marine (competition - racers & performance propellers, Zero Effort Controls™, K-Plane™ high performance trim tabs, Mercury Racing Trim Indicators™, high performance engines, competition drive, etc.) cigarette boat, welcraft, scarab, donzi boats, catamaran raceboat, high speed twin hull, etc. Bullock Marine is an authorized dealer for Douglas Marine Skater Powerboat, Regy Fountain powerboat & sport boat, Eliminator powerboat & sport boat, and Mercury Mercruiser marine engines, Drive & accessories. Mercury Mercruiser HP 1075 SCi 1075 HP marine engines racing boats Mercury Marine HP 575 SCi 575 HP Sterndrives performance boat Mercruiser HP 525 EFI 525 HP race boat engine for sale powerboats Mercury Mercruiser HP 500 EFI 500 HP stern drives power boat Mercury Marine Scorpion 377 377 HP marine engines high performance boats Mercruiser 496 MAG High Output 425 HP Sterndrives sport boat Mercury Mercruiser 496 MAG 375 HP race boat engine for sale powerboat Mercury Marine MX 6.2 MPI Horizon 320 HP stern drives performance boats Mercruiser MX 6.2 MPI 320 HP marine engines power boats Mercury Mercruiser 350 MAG MPI Horizon 300 HP Sterndrives engines Mercury Marine 350 MAG MPI 300 HP race boat engine for sale mercruiser Mercury Drive Dry-Sump Six drive racing mercruiser powerboats mercury Bravo One XR Sport Master sport boat drives sport boat V SSM drive mercury race power boats III-A SSM drives mercury mercruiser racing boats Bravo One XR drive powerboat Bravo X Diesel mercruiser drives sport boats Bravo XR mercury drive for sale power boats Bravo X drives mercruiser boats Bravo mercury drive sales pleasure Alpha drive mercruiser boat

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