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

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.

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

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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

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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
Compatible drives (application dependent - contact sales or service)	Bravo One 1.50:1 Bravo One 1.65:1 Bravo Three 1.81:1 Bravo Three 2.00:1 Bravo Three 2.20:1 Bravo Three 2.43:1 Bravo Two 2.00:1 Bravo Two 2.20:1 Bravo Two 2.43:1

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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

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Documents

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.