Mercury Mercruiser Engines

Multiport Fuel Injection MPI 496 MAG H.O. - 425 hp

The 425 hp 496 MAG H.O. is the most powerful MerCruiser engine available in our standard lineup. A special camshaft profile and unique fuel and spark calibration combine to provide an additional 50 hp and a 200 RPM higher operating range compared to the 496 MAG. Its massive power is coupled to a beefy Bravo X series drive with a number of performance drive options available for faster boats. Even with the additional horsepower, the 496 MAG H.O. is amazingly well-mannered and reliable. Standard low-restriction exhaust with stainless steel elbows, along with our most sophisticated spark and fuel injection systems, deliver outstanding acceleration and top speed.

   Mercury Mercruiser Marine Engines Multiport Injection MPI 496 MAG H.O. - 425 hp

RELIABILITY

  • PCM 555 sequential fuel injection and high energy distributorless ignition system ensure reliable starts and outstanding performance, year after year
  • Exclusive Engine Guardian protection senses potential problems and virtually eliminates the chance for engine damage due to overheating, low oil pressure, or low drive lube
  • Cartridge-type water-separating fuel filter helps protect fuel system and engine against damage
  • Proven GM cast iron big block V8 power for years of reliable operation
  • 316 Stainless Steel dry-joint exhaust elbows better resist high temperature and corrosion and improve exhaust flow for more power
  • Brass sea water pump housing improves life and better resists damage from running dry

PERFORMANCE

  • Long individual runner intake manifold design provides optimum torque and horsepower for demanding marine applications
  • Tuned runner exhaust manifold lowers exhaust backpressure for best torque and power
  • Sequential Multi-Port Fuel Injection provides easy starts, cold or hot, and automatically adjusts for changes in temperature, weather, or altitude for terrific performance in any environment
  • High Energy distributorless ignition with knock control maximizes power and protects against low quality fuels
  • Standard anti-feedback power steering helps reduces operator fatigue and makes boat handling a breeze
  • Low restriction flame arrestor for added horsepower and torque

EASY OWNERSHIP

  • 3-year/300 hour maintenance interval on many periodic service items saves time and money
  • Convenient top-mounted remote oil filter and threaded dipstick tube make oil changes cleaner and keep periodic servicing quick and simple
  • Color-coded service points makes checking fluid levels simple and straightforward
  • Operates on easy to find, less expensive 87 octane fuel
  • Engine-mounted drive lube monitor for easy lube check or add from inside the boat
  • Long-life anti-freeze only requires replacement every 5 years
  • Single point air-actuated water drain system standard

TECHNOLOGY

  • The DTS (Digital Throttle & Shift) option eliminates push-pull cables and related maintenance while providing silky-smooth operation and unsurpassed responsiveness. DTS provides an unprecedented level of control and precision for docking and low-speed maneuvering. Available as an additional option, precision SmartTow speed control includes an easy-to-use launch control that makes pulling skiers and wakeboarders as simple as pushing a button
  • Standard features with DTS are: Autosynch of multiple engines, SmartStart, Shift Protection, Multiple Helm capability, and Shadow Technology for triple and quad engine installations
  • MerCathode galvanic corrosion prevention system offers unmatched active electronic corrosion protection
  • 496 MAG and 496 MAG H.O. engines are designed to display engine information on your choice of analog or SmartCraft digitally-driven gages and displays

Power 425HP (312 kW)
Full Throttle Range 4600-5000 RPM
Displacement 496 CID (8.1L)
Engine Type V8
Bore & Stroke 4.25" X 4.38" (108mm X 111mm)
Compression Ratio 9.1:1
Fuel Requirement 87 Octane (R+M)/2
Engine Control System PCM 555 with SmartCraft CAN Capability
Fuel Delivery System Gen III Cool Fuel
Fuel Injection System Sequential Multi-Point Electronic Fuel Injection
Induction System 2-pieceLong Runner intake with 75mm Throttle Body (80mm w/DTS)
Ignition System Distributorless Ignition w/Knock Control and Platinum Spark Plugs
Charging System 65 Amp/917 Watt Alternator
Water Drain System Single Point Air-Actuated
Exhaust System Tuned Runner Exhaust Manifolds with 316 Stainless Steel Tubular Dry Joint Elbows
Cooling System Closed Cooling, Long Life 5-Year Anti-Freeze, Brass Sea Water Pump
Accessory Drive System Serpentine Belt, Stainless Steel Spring Automatic Tensioner
Recommended Engine Oil Mercury MerCruiser Full-Synthetic Engine Oil, 20W-40, NMMC FC-W rated
Engine Guardian System Low Oil Pressure, High Coolant Temperature, High Exhaust Manifold Temperature, Low Drive Lube, Low Sea Water Pressure, Low Voltage, Over-rev control, Knock Control
Bravo One, Bravo One X Ratios 1.36, 1.50, 1.65(H)
Bravo Two, Bravo Two X Ratios 1.81, 2.00, 2.20(H)
Bravo Three, Bravo Three X Ratios 1.81, 2.00, 2.20,(H)
Bravo One XR Ratios 1.26, 1.35, 1.50
Bravo Three XR Ratios 2.0
Dimensions (LxWxH) in 35x 33 x 24
Dimensions (LxWxH) mm 878 x 838 x 610
Weight w/ Bravo One, X, XR (lbs./kg) 1199/544
Weight w/ Bravo Two, X (lbs./kg) 1214/551
Weight w/ Bravo Three, X (lbs./kg) 1224/556
Digital Throttle and Shift Optional


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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 I.T.S.racing 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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