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Mercury® Remanufacturing
Plus-Series Inboards

Value performance for your inboard repower.

Standard and opposite rotation versions are available

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383 MAG Inboard 4V

383 MAG Inboard 4V

350 Crankshaft Horsepower

Thanks to its size and power this is the ideal replacement engine for 350 MAG, 7.4L, and 7.4L MPI engines that power cruisers, small boats and large runabouts.

8.1L Horizon Inboard

8.1L Horizon Inboard

370 Crankshaft Horsepower

The ideal big-block repower for your inboard yacht. This is the ideal replacement inboard engine for any make of 7.4, 454, 8.2, 502 or 8.1 engines that power twin-engine inboard boats.

Specifications

Mercury® Remanufacturing: Plus-Series Inboards

8.1L Horizon 357 Horizon Inboard 383 MAG Stroker Inboard 383 MAG Inboard 4V
  • Part number
    • 8M0088282 - inline (transmission not included) / 8M0088283 V-drive (transmission not included)
    HP / kW @ flywheel
    • 375 / 272
    Maximum RPM (WOT)
    • 4200 - 4600
    Engine type
    • Remanufactured 8.1L Mercury V-8 iron block and heads
    Displacement (CID/L)
    • 496 / 8.1
    Bore and stroke
    • 4.25 x 4.38" / 108 x 111 mm
    Compression ratio
    • 9.1:1 with hypereutectic pistons
    Fuel requirement
    • 87 octane (R+M)/2
    Engine control system
    • PCM 555
    Fuel delivery system
    • GEN III cool fuel
    Fuel injection system / carburetor type
    • Sequential multi-point electronic fuel injection (MPI)
    Air induction
    • Two-piece long runner intake with 75 mm throttle body (80 mm w/DTS)
    Ignition
    • Distributorless ignition with knock control
    Alternator amp / Watt
    • 65 amp / 917 watt
    Water drain system
    • Single point air actuated
    Exhaust system
    • Iron manifolds with 4" / 102 mm diameter 316 stainless steel dry joint exhaust elbows
    Cooling system
    • Brass sea water pump
    • Closed cooling
    • Long life 5-year antifreeze
    Accessory drive system
    • Serpentine belt
    Lubrication system
    • High flow oil pump and copper engine oil cooler
    Recommended oil
    • SAE 25W-40 NMMA Certified FC-W Synthetic Blend
    Engine guardian system
    • Exhaust manifold temperature
    • High coolant temperature
    • Knock control
    • Low oil pressure
    • Low voltage
    • Low water pressure
    • Over-rev
    • Transmission temperature
    Transmission coupler
    • Dual-stage coupler - must be changed for 72C transmissions
    Dimensions (L x W x H)
    • 47 x 33 x 24" / 1194 x 838 x 610 mm when installed with transmission
    Weight (engine only)
    • 1130 lbs / 513 kg when installed with transmission
    Print Compare With Other Products
  • Part number
    • 8M0064805 Inline / 8M0076188 V-Drive
    HP / kW @ flywheel
    • 310 / 231
    Maximum RPM (WOT)
    • 4400 - 4800
    Engine type
    • Remanufactured 5.7L GM V-8 Marine Iron Block & Vortec Heads
    Displacement (CID/L)
    • 357 / 5.8
    Bore and stroke
    • 4.04 x 3.48" / 103 x 88 mm
    Compression ratio
    • 9.4:1
    Fuel ethanol tolerance
    • Up to 10%
    Engine control system
    • Crank Fired High Voltage Switch with Knock Control
    Fuel delivery system
    • MPI with Gen II Cool Fuel
    Air induction
    • Two-piece long runner intake with 75 mm throttle body (80 mm w/DTS)
    Alternator amp / Watt
    • 65 amp / 917 watt
    Water drain system
    • Single Point Air-Actuated Water Drain with Flush Port
    Exhaust system
    • Iron manifold with Dry-Joint Exhaust Elbow
    Cooling system
    • Full Closed Cooled System - Manifolds Included
    Accessory drive system
    • Serpentine belt
    Lubrication system
    • High Flow Oil Pump
    Recommended oil
    • Mercury MerCruiser Synthetic Blend 25W-40, NMMA FC-W rated
    Cranktrain
    • Powder Metal Rods and Nodular Iron Crankshaft
    Rocker arms
    • 1.6:1 Full Roller
    Dimensions (L x W x H)
    • 40 x 30 x 22" / 1092 x 740 x 559 mm
    Weight (engine only)
    • 980 lbs / 444 kg
    Print Compare With Other Products
  • Part number
    • 865108R10
    HP / kW @ flywheel
    • 350 / 261
    Maximum RPM (WOT)
    • 4600 - 5000
    Engine type
    • V-8 Remanufactured Iron Marine Block
    Displacement (CID/L)
    • 383 / 6.3
    Bore and stroke
    • 4.03 x 3.75" / 102 x 95 mm
    Compression ratio
    • 9.0:1
    Fuel ethanol tolerance
    • Up to 10%
    Engine control system
    • ECM 555 W/Knock Control & Crankshaft Trigger
    Fuel delivery system
    • GEN III cool fuel
    Fuel injection system / carburetor type
    • Multi-point electronic fuel injection (MPI)
    Air induction
    • Two-piece long runner intake with 75 mm throttle body (80 mm w/DTS)
    Alternator amp / Watt
    • 65 amp / 917 watt
    Water drain system
    • Multi-point drain
    Exhaust system
    • Electro-deposition paint coated warm iron manifold with wet joint elbow
    Cooling system
    • 160F Raw Water Bravo with Sea Water Pump
    Accessory drive system
    • Serpentine belt
    Lubrication system
    • High Flow 100 psi Oil Pump
    Recommended oil
    • Mercury MerCruiser Synthetic Blend 25W-40, NMMA Certified FC-W Synthetic Blend
    Pistons
    • Cast Hypereutectic Alloy
    Cranktrain
    • Powder Metal Rods and Forged 4340 Steel Crankshaft
    Rocker arms
    • 1.6:1 Roller Tip Steel
    Dimensions (L x W x H)
    • 32 x 30 x 22" / 814 x 740 x 559 mm
    Weight (engine only)
    • 932 lbs / 423 kg
    Print Compare With Other Products
  • Part number
    • 8M0061212 - Standard (LH) Rotation - Transmission not included / 8M0061213 - Opposite (RH) Rotation - Transmission not included
    HP / kW @ flywheel
    • 340 / 254
    Maximum RPM (WOT)
    • 4600 - 5000
    Engine type
    • Remanufactured GM V8 Marine Iron Block & Gen+ Heads - 062 Casting
    Displacement (CID/L)
    • 383 / 6.3
    Bore and stroke
    • 4.03 x 3.75" / 102 x 95 mm
    Compression ratio
    • 9.0:1 with Hypereutectic Pistons
    Fuel ethanol tolerance
    • Up to 10%
    Fuel requirement
    • 87 octane (R+M)/2
    Engine control system
    • Thunderbolt V w/Knock Control - MIE Calibration
    Fuel delivery system
    • 4V carburetor and mechanical fuel pump
    Fuel injection system / carburetor type
    • 750 cfm Weber 4V with electric choke
    Air induction
    • Dual Plane Aluminum Intake Manifold with Bronze Inserts
    Alternator amp / Watt
    • 65 amp / 917 watt
    Water drain system
    • Multi-point drain - Hand Removable Blue Drain Plugs
    Exhaust system
    • Iron manifold with Dry-Joint Exhaust Elbow
    Cooling system
    • Thermostatically Controlled Raw Water - 143F
    Accessory drive system
    • Serpentine belt
    Lubrication system
    • High Flow 100 psi Oil Pump and Copper Oil Cooler
    Recommended oil
    • SAE 25W-50 FC-W synthetic blend racing oil
    Rocker arms
    • 1.6:1 Full Roller Aluminum
    Dimensions (L x W x H)
    • 43 x 29 x 22" / 1092 x 737 x 559 mm
    Weight (engine only)
    • 980 lbs / 444 kg - When Installed with 72C Transmission
    Print Compare With Other Products

Documents

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You can order all available Mercury literature online or through any authorized Mercury dealer. Please have your outboard or sterndrive serial number before placing the order.

  • Operation, Maintenance, and Warranty Manuals
  • Parts Manual
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Installation Drawings
Installation Drawings

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