Mercury® Remanufacturing
Plus-Series Alpha Sterndrives

A line to repower sterndrive boats with value performance.

Ready to pair up with an Alpha® drive.

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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.

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

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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Installation Drawings