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Mercury® MerCruiser®
Inboards

One size doesn't fit all

Proven technology, rock-solid reliability and an unbeatable combination of performance and fuel efficiency.

  • HP / kW 425 / 317
  • Maximum RPM (WOT) 4400 - 4800
  • Engine type V-8
  • Displacement (L) 8.2
  • Fuel delivery system Multi-point Electronic Fuel Injection (MPI), Sequential Fuel Injection with DTS

The specifications displayed here may not be indicative of the entire engine family; click on the “See All Models and Specs” link to view the specs in detail.

See All Models and Specs

Corrosion Protection.

Corrosion Protection.

The freshwater closed-cooling system (standard) dramatically limits potential corrosion. In fact, Mercury® is so bullish about the anti-corrosion technology built into these engines, we offer a standard four-year limited corrosion warranty in addition to the three-year limited factory-backed warranty.

Fuel-Efficient.

Fuel-Efficient.

Electronic multi-port injection (MPI) and standard Emissions Control Technology (ECT) combine to deliver precisely the correct amount of fuel for every stage of operation – no more, no less. The result is fuel economy that stretches your boat’s range and your dollar.

Power & Performance.

Power & Performance.

High-displacement volume and premium MPI fuel injection combine to deliver outstanding acceleration, instant planing and smooth performance throughout the rpm band. Mercury® SmartCraft® Digital Throttle & Shift is standard, providing precision throttle response and effortless steering.

Durable & Reliable.

Durable & Reliable.

Mercury’s Engine Guardian continually monitors critical sensors for any sign of a problem and immediately takes action, while the water-cooled Cool Fuel delivery system prevents vapor lock. Rugged construction, including stainless-steel exhaust, ensures long-term, hassle-free operation.

Specifications

Mercury® MerCruiser®: Inboards

  • HP / kW
    • 425 / 317
    Maximum RPM (WOT)
    • 4400 - 4800
    Engine type
    • V-8
    Displacement (L)
    • 8.2
    Bore and stroke
    • 4.47 x 4.00" / 113.5 x 101.6 mm
    Compression ratio
    • 8.75:1
    Recommended fuel
    • Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum
    Engine control system
    • PCM 09 with SmartCraft CAN capability OBD-M diagnostics Dual oxygen sensors
    Fuel delivery system
    • Multi-point Electronic Fuel Injection (MPI)
    • Sequential Fuel Injection with DTS
    Air induction
    • High inertia induction system
    Ignition
    • Distributorless ignition with knock control
    Alternator amp / Watt
    • 65 amp / 917 watt
    Water drain system
    • Single point air actuated
    Exhaust system
    • Tuned runner exhaust manifolds with 316 stainless steel tubular dry joint elbows
    Cooling system
    • Brass sea water pump
    • Closed cooling
    • Long life 5-year antifreeze
    Accessory drive system
    • Auto-tensioner
    • Serpentine belt
    Recommended oil
    • NMMA Certified FCW 25W-40 Synthetic Blend
    Engine guardian system
    • SmartCraft Engine Guardian
    Dimensions (L x W x H)
    • 35 x 33 x 24" / 878 x 838 x 610 mm
    Weight (engine only)
    • 1,122 lbs / 509 kg
    Compatible drives
    • ZF 63A Down Angle
    • ZF 63IV V-Drive
    Print Compare With Other Products
  • HP / kW
    • 375 / 280
    Maximum RPM (WOT)
    • 4200 - 4600
    Engine type
    • V-8
    Displacement (L)
    • 8.2
    Bore and stroke
    • 4.47 x 4.00" / 113.5 x 101.6 mm
    Compression ratio
    • 8.75:1
    Recommended fuel
    • Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum
    Engine control system
    • PCM 09 with SmartCraft CAN capability OBD-M diagnostics Dual oxygen sensors
    Fuel delivery system
    • Multi-point Electronic Fuel Injection (MPI)
    • Sequential Fuel Injection with DTS
    Air induction
    • High inertia induction system
    Ignition
    • Distributorless ignition with knock control
    Alternator amp / Watt
    • 65 amp / 917 watt
    Water drain system
    • Single point air actuated
    Exhaust system
    • Tuned runner exhaust manifolds with 316 stainless steel tubular dry joint elbows
    Cooling system
    • Brass sea water pump
    • Closed cooling
    • Long life 5-year antifreeze
    Accessory drive system
    • Auto-tensioner
    • Serpentine belt
    Recommended oil
    • NMMA Certified FCW 25W-40 Synthetic Blend
    Engine guardian system
    • SmartCraft Engine Guardian
    Dimensions (L x W x H)
    • 35 x 33 x 24" / 878 x 838 x 610 mm
    Weight (engine only)
    • 1,122 lbs / 509 kg
    Compatible drives
    • ZF 63A Down Angle
    • ZF 63IV V-Drive
    Print Compare With Other Products
  • HP / kW
    • 350 / 261
    Maximum RPM (WOT)
    • 5000-5400
    Engine type
    • V8, 2-valve/cylinder pushrod
    Displacement (L)
    • 6.2
    Bore and stroke
    • 4.0 x 3.75" / 101.6 x 95.25 mm
    Fuel requirement
    • 90 RON 10% Ethanol Maximum
    • Unleaded Regular 87 Octane Minimum (R+M/2)
    Engine control system
    • SmartCraft PCM 112
    • Standard SmartCraft with DTS
    Fuel delivery system
    • Computer controlled Multi-Port Electronic Fuel Injection (MPI)
    Starting
    • Electric (turn-key)
    • Smart Start Electric
    Air induction
    • Performance-Tuned Scroll Intake Manifold
    Ignition
    • SmartCraft PCM 112 Digital Inductive
    Alternator amp / Watt
    • Fully regulated belt-driven 70 amp (882 watt)
    Water drain system
    • Air Actuated "Season Extender"
    Exhaust system
    • Through transom
    Cooling system
    • Fresh water cooled (closed cooling)
    Lubrication system
    • Integrated wet sump
    Recommended oil
    • NMMA Certified FCW 25W-40 Synthetic Blend
    Engine guardian system
    • SmartCraft Engine Guardian
    Gear shift
    • F-N-R
    Transmission and Ratio
    • 63 A: 1.216, 1.5:1, 2.0:1, 2.5:1
    • 63 IV: 1.5:1, 2.0:1, 2.5:1
    Dimensions (L x W x H)
    • 28 x 30 x 22" / 696 x 740 x 559 mm
    Weight (engine only)
    • 862 lbs / 391 kg
    Print Compare With Other Products
  • HP / kW
    • 300 / 224
    Maximum RPM (WOT)
    • 5000-5400
    Engine type
    • V8, 2-valve/cylinder pushrod
    Displacement (L)
    • 6.2
    Bore and stroke
    • 4.0 x 3.75" / 101.6 x 95.25 mm
    Fuel requirement
    • 90 RON 10% Ethanol Maximum
    • Unleaded Regular 87 Octane Minimum (R+M/2)
    Engine control system
    • SmartCraft PCM 112
    • Standard SmartCraft with DTS
    Fuel delivery system
    • Computer controlled Multi-Port Electronic Fuel Injection (MPI)
    Starting
    • Electric (turn-key)
    • Smart Start Electric
    Air induction
    • Performance-Tuned Scroll Intake Manifold
    Ignition
    • SmartCraft PCM 112 Digital Inductive
    Alternator amp / Watt
    • Fully regulated belt-driven 70 amp (882 watt)
    Water drain system
    • Air Actuated "Season Extender"
    Exhaust system
    • Through transom
    Cooling system
    • Fresh water cooled (closed cooling)
    Lubrication system
    • Integrated wet sump
    Recommended oil
    • NMMA Certified FCW 25W-40 Synthetic Blend
    Engine guardian system
    • SmartCraft Engine Guardian
    Gear shift
    • F-N-R
    Transmission and Ratio
    • 63 A: 1.216, 1.5:1, 2.0:1, 2.5:1
    • 63 IV: 1.5:1, 2.0:1, 2.5:1
    Dimensions (L x W x H)
    • 28 x 30 x 22" / 696 x 740 x 559 mm
    Weight (engine only)
    • 862 lbs / 391 kg
    Print Compare With Other Products
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