Mercury® Remanufacturing
Plus-Series Inboards
Standard and opposite rotation versions are available
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
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
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.
Specifications
Mercury® Remanufacturing: Plus-Series Inboards
-
Print Compare With Other ProductsPart 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 ProductsPart 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
Documents
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
- 357 Horizon Inboard Operator's Manual
- 357 Horizon Inboard Product Data Sheet
- 383 MAG Inboard 4V Operator's Manual
- 383 MAG Inboard 4V Product Data Sheet
- 8.1L Horizon Operator's Manual
- 8.1L Horizon Product Data Sheet
- Remanufacturing Guide
- Repowering Sterndrive & Inboard Engines with Exhaust Regulations
