Well it looks as if Mercury is flexing their muscle once again with a new alternative engine replacement. This new 540CID engine package called the 540MAG Bravo 4V . Mercruiser is clear to point out the engine brings 560Ft Lbs of torque but with the rated horsepower numbers we are lead to believe they have cautiously played down the engines actual horsepower.

Mercruiser recognizes there’s a world of old tired worn out 454-502 carburetor and fuel injected engines in service that could benefit from a solid powerplant upgrade that comes with a 1 year warrantied direct replacement option for those boaters who want a simple and quick option compared to a full rebuild from an independent builder.

While this new option has not yet been publicly announced, as always PowerBoatNation has got our ear to the water on whats coming in the industry and we bring it to you as soon as we can.


Power 440 HP (328 kW)
Full Throttle Range 4200-4600 RPM
Displacement 540 CID (8.9L)
Engine Type 8.9L Mercury V8 Iron Block & Remanufactured Heads
Bore & Stroke 4.50” X 4.25” (114 mm X 108 mm)
Compression Ratio 8.6:1 With Forged Pistons
Rocker Arm Ratio 1.7:1 Stamped Steel
Fuel Requirement 87 Octane (R+M)/2
Fuel System Holley 800 CFM Electric Choke Carburetor, Mechanical Fuel Pump
Induction System Single-Plane Aluminum Intake With Bronze Crossover & Pads
Ignition System Thunderbolt V with Knock Control
Charging System 65 Amp / 917 Watt Alternator
Water Drain System Multi-Point Drain – Hand Removeable Blue Drain Plugs
Exhaust System Iron Manifolds with 4” Dia. 316 SS Dry Joint Exhaust Elbows
Cooling System Thermostatically Controlled Raw Water – 143 F
Accessory Drive System Serpentine Belt
Lubrication System High Flow Oil Pump , Copper Oil Cooler, Oil Thermostat
Recommended Engine Oil SAE 25W50 FC-W Synthetic Blend Racing Oil
Audio Warning System Oil Pressure, Coolant Temperature, Drive Lube
Bravo One X & XR Ratios: 1.36, 1.50:1
Bravo One XZ Ratio: 1.50:1
Bravo Two X Ratio: 1.81:1
Bravo Three X Ratio: 1.81:1
Bravo Three XR Ratios: 1.81, 2.00:1
Dimensions (LxWxH) 34” x 33” x 27” (871 mm x 830 mm x 689 mm)
Engine Weight (lbs./kg) 1025 / 465
Fresh Water Cooling: Not Available
Engine Only Part Number 8M0085999

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