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  1. #11
    Registered TSPM's Avatar
    My Boats:
    Join Date
    Jul 2004
    ~ Long Island ~ NY

    496 MAG MPI - 375 hp

    Power 375HP (280 kW)
    Full Throttle Range 4400 - 4800 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 SAE 25W-40 NMMA Certified FC-W
    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

  2. #12
    Registered TSPM's Avatar
    My Boats:
    Join Date
    Jul 2004
    ~ Long Island ~ NY
    Quote Originally Posted by jtmiller02 View Post
    Both have a 5 year warranty also, hop up a regular 496 with a kit of any sort and kiss that warranty goodbye. If you are shopping for new motors this could be an important consideration.
    1 YEAR MFG warranty on both motors not 5. You can pay for the extended warranty to 5 or 6 but factory is 1 YEAR

  3. #13
    Join Date
    Oct 2004
    Newbury Park, CA
    A while back I checked the replacment parts list for the 496 Mag vs. the 496 HO. Every part was the same except the camshaft and ECU. Even the valve springs were the same. They basically undercammed the 496 to create the 496 Mag. The HO is pure profit for Mercury Marine, because it doesn't cost them a cent more to grind a cam differently or program an EUC for a 496 HO, but they charge about $4000 more than a non-HO. Marketing at its best! Gotta love em!


  4. #14
    Join Date
    Jan 2006
    Maybe the difference is only 27 HP. Check out the GM marine Hp/Torque charts here


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