Mercury® Remanufacturing
Plus-Series Inboards

Value performance for your inboard repower.

Standard and opposite rotation versions are available

See All Models and Specs

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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.

Owners Manuals

Owners Manuals

Need an Owner’s Manual for your Mercury engine to perform maintenance, replace parts or just learn more about your engine? Mercury has made it easy for you to purchase a printed copy or to download and print your own copy. To order a printed version of the Service Manual for your particular Mercury Outboard or MerCruiser Engine, click here.  

Find Your Manual

Specifications

Mercury® Remanufacturing: Plus-Series Inboards

  • 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

Buy the Books
Buy the Books

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
  • Service Manual

Purchase a Manual

Brochures
Brochures
Installation Drawings
Installation Drawings

See All Installation Drawings

Related Documents
Related Documents
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