Mercruiser 4.3L Alpha 4V

Short description:

Mercruiser 4.3L Alpha 4V


1 year Mercruiser Warranty


Mercruiser Remanufactured 4.3L Alpha 4V

Mercruiser offers this remanufactured "turn-key" 4.3L marine engine to replace 3.0L & 4.3L Alpha applications. This is a V-6 that makes more power than a 5.0L V-8. Replaces 3.0L, 4.3L, 5.0L powered runabouts while delivering V-6 fuel economy.



225 HP (168 kW)

Full Throttle Range

4400-4800 RPM


CID 265 (4.3L)

Engine Type

Remanufactured GM V6 Marine Iron Block & Heads

Bore & Stroke

4.030” x 3.480” (102mm x 88mm)

Compression Ratio

9.4:1 with Cast Alloy Pistons

Rocker Arm Ratio

1.5:1 Full Roller Steel


Cast Hypereutectic Alloy w/ Teflon Coated Skirt


Powder Metal Rods and Nodular Iron Crankshaft

Fuel Requirement

87 Octane (R+M)/2

Fuel System

Weber 600 cfm 4V Electric Choke Carburetor & Electric Fuel Pump

Induction System

Dual Plane Iron Intake Manifold

Ignition System

Thunderbolt V

Charging System

65 Amp/917 Watt Alternator

Water Drain System

Multi-Point Drain – Hand Removable Blue Drain Plugs

Exhaust System

2-Piece Exhaust – Iron Manifold with Wet-Joint Exhaust Elbow

Cooling System

Thermostatically Controlled Raw Water – 160 F

Accessory Drive System

Serpentine Belt

Lubrication System

High Flow Oil Pump

Recommended Engine Oil

SAE 25-40 NMMA Certified FC-W Synthetic Blend

Audio Warning System

Oil Pressure, Coolant Temperature, Drive Lube

Alpha Ratios

1.47:1, 1.62:1, 1.81:1

Dimensions (LxWxH)

28” x 30” x 22”

Engine Weight

784 lbs

Boat Harness Type


Our Shipping Policy


We ship our engines all over the world. In the domestic US, we ship via FedEx Freight, although on occasion other freight carriers may be used. We usually need a 1 business day handling time on our engines. Please give us a call at 877-639-2881 or by email at to request a shipping quote.

Our standard shipping cost is shipping to a business location or to the closest freight terminal to you. A list of Fedex Freight terminals can be found here

Residential Delivery with liftgate adds $75 to the shipping cost.


Our engines have been shipped all over the world. We usually ship via ocean and air freight depending on how much of a rush our customers are in. To request a shipping quote please email us at with the following information:

  • item part #
  • desination country and postal code

We'll get back to you quickly with a shipping quote!

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