Mercury® Remanufacturing
Plus-Series Alpha Sterndrives

A line to repower sterndrive boats with value performance.

Ready to pair up with an Alpha® drive.

See All Models and Specs

4.3L Alpha 4V

4.3L Alpha 4V

225 Crankshaft Horsepower

WOW! A V-6 that makes more power than a 5.0L V-8. Replaces 4.3L- and 5.0L-powered runabouts while delivering V-6 fuel economy.

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.  

Specifications

Mercury® Remanufacturing: Plus-Series Alpha Sterndrives

  • Part number
    • 863611R11
    HP / kW @ flywheel
    • 300 / 224
    Maximum RPM (WOT)
    • 4600 - 5000
    Engine type
    • V-8 Remanufactured Iron Marine Block
    Displacement (CID/L)
    • 355 / 5.8
    Bore and stroke
    • 4.03 x 3.48" / 103 x 88 mm
    Compression ratio
    • 9.4:1
    Fuel ethanol tolerance
    • Up to 10%
    Engine control system
    • ECM 555 W/Knock Control & Crankshaft Trigger
    Fuel delivery system
    • GEN II Cool Fuel with Boost Pump
    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
    • Iron manifold with Dry-Joint Exhaust Elbow
    Cooling system
    • 160F Raw Water Alpha
    Accessory drive system
    • Serpentine belt
    Lubrication system
    • High Flow 60 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 Nodular Iron Crankshaft
    Rocker arms
    • 1.5:1 Stamped 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)
    • Alpha 1.47:1
    • Alpha 1.81:1
    Print Compare With Other Products
  • Part number
    • 8M0178620
    HP / kW @ flywheel
    • 225 / 168
    Maximum RPM (WOT)
    • 4200 - 4600
    Engine type
    • V-6 Remanufactured Iron Marine Block
    Displacement (CID/L)
    • 265 / 4.3
    Bore and stroke
    • 4.03 x 3.48" / 102 x 88 mm
    Compression ratio
    • 9.4:1
    Fuel ethanol tolerance
    • Up to 10%
    Fuel requirement
    • 87 octane (R+M)/2
    Engine control system
    • EST
    Fuel delivery system
    • 4V carburetor and electric fuel pump
    Fuel injection system / carburetor type
    • 600 cfm Weber 4V with electric choke
    Air induction
    • Dual plane iron intake manifold
    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
    Accessory drive system
    • Serpentine belt
    Lubrication system
    • High Flow 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 Nodular Iron Crankshaft
    Rocker arms
    • 1.5:1 Full Roller Steel
    Dimensions (L x W x H)
    • 28" x 30" x 22" / 696mm x 740mm x 559 mm
    Weight (engine only)
    • 784 lbs / 356 kg
    Compatible drives (application dependent - contact sales or service)
    • Alpha 1.47:1
    • Alpha 1.62:1
    • Alpha 1.81:1
    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

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