Skip to main content

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)
    • 1159 lbs / 526 kg
    Compatible drives
    • ZF 63A Down Angle
    • ZF 63IV V-Drive
    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)
    • 1159 lbs / 526 kg
    Compatible drives
    • ZF 63A Down Angle
    • ZF 63IV V-Drive
    Compare With Other Products
  • HP / kW
    • 320 / 239
    Maximum RPM (WOT)
    • 4600 - 5000
    Engine type
    • V-8
    Displacement (L)
    • 6.2
    Bore and stroke
    • 4.00 x 3.75" / 101 x 95 mm
    Compression ratio
    • 9.0:1
    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)
    Air induction
    • Two-piece long runner intake with 80 mm throttle body
    Ignition
    • Crank fired high voltage switch with knock control
    Alternator amp / Watt
    • 65 amp / 917 watt
    Water drain system
    • Single point air actuated
    Exhaust system
    • Electro-deposition paint coated exhaust manifolds with dry joint design through prop
    Cooling system
    • Brass sea water pump
    • Closed cooling
    • Long life 5-year antifreeze
    Accessory drive system
    • Serpentine belt
    Recommended oil
    • NMMA Certified FCW 25W-40 Synthetic Blend
    Engine guardian system
    • SmartCraft Engine Guardian
    Dimensions (L x W x H)
    • 43 x 30 x 22" / 1092 x 740 x 559 mm
    Weight (engine only)
    • 853 lbs / 388 kg
    Compatible drives
    • ZF 63A Down Angle
    • ZF 63IV V-Drive
    Compare With Other Products
  • HP / kW
    • 300 / 224
    Maximum RPM (WOT)
    • 4600 - 5000
    Engine type
    • V-8
    Displacement (L)
    • 5.7
    Bore and stroke
    • 4.00 x 3.48" / 101 x 88 mm
    Compression ratio
    • 9.4:1
    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)
    Air induction
    • Two-piece long runner intake with 80 mm throttle body
    Ignition
    • Crank fired high voltage switch with knock control
    Alternator amp / Watt
    • 65 amp / 917 watt
    Water drain system
    • Single point air actuated
    Exhaust system
    • Electro-deposition paint coated exhaust manifolds with dry joint design through prop
    Cooling system
    • Brass sea water pump
    • Closed cooling
    • Long life 5-year antifreeze
    Accessory drive system
    • Serpentine belt
    Recommended oil
    • NMMA Certified FCW 25W-40 Synthetic Blend
    Engine guardian system
    • SmartCraft Engine Guardian
    Dimensions (L x W x H)
    • 43 x 30 x 22" / 1092 x 740 x 559 mm
    Weight (engine only)
    • 853 lbs / 400 kg
    Compatible drives
    • ZF 63A Down Angle
    • ZF 63IV V-Drive
    Compare With Other Products
Scroll to Top