Specifications

Mercury® Remanufacturing: Plus-Series Alpha Sterndrives

 4.3L Alpha 4V
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

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http://www.mercurymarine.com/en/us/engines/inboard-and-sterndrive/remanufacturing/plus-series-alpha-sterndrives/43l-alpha-4v