496 mag vs 496 mag HO

Old 05-20-2007, 02:51 PM
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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
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Old 05-20-2007, 02:53 PM
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Originally Posted by jtmiller02
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
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Old 05-20-2007, 03:25 PM
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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!

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Old 05-20-2007, 09:02 PM
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Maybe the difference is only 27 HP. Check out the GM marine Hp/Torque charts here

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