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.

1-Year Factory Warranty

Available when purchased through any Mercury/MerCruiser authorized dealer

2 Additional Years of Coverage

Available from Mercury Product Protection



Part Number 865108R89
Horsepower @ flywheel 225
Kilowatts @ flywheel 168
Maximum RPM (WOT) 4400-4800
Cylinders V-6 Remanufactured Iron Marine Block
Displacement (CID/L) 265 / 4.3
Bore & Stroke (in/mm) 4.03 x 3.48in
102 x 88mm
Compression Ratio 9.4:1
Fuel / Ethanol Tolerance 87 octane / up to 10% ethanol
Engine Control System Thunderbolt V
Fuel Delivery System 4V carburetor and electric fuel pump
Fuel Injection System / Carburetor Type 600 cfm Weber 4V with electric choke
Induction System Dual plane iron intake manifold
Charging alternator amp 65
Charging alternator watt 917
Water drain system Multi-point drain
Exhaust System Electro-deposition paint coated warm iron manifold with wet joint 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 FC-W rated
Pistons Cast Hypereutectic Alloy
Cranktrain Powder Metal Rods and Nodular Iron Crankshaft
Rocker Arms 1.5:1 Full Roller Steel
Length (in/mm) 28in / 696mm
Width (in/mm) 30in / 740mm
Height (in/mm) 22in / 559mm
Weight (lbs/kg) 784lbs / 356kg
Features & Related Products Analog Controls
Analog Gauges
Full closed cooling (KIT)
Hydraulic / Power steering
Compatible Drives (Application Dependant - Contact Sales or Service) Alpha 1.47:1
Alpha 1.62:1
Alpha 1.81:1

Back to Plus-Series Engines

Plus-Series Promo