350 MPI Alpha 300HP

Call (305) 826-2202 for Pricing & Availability

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30.00 (in)
22.00 (in)
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Thanks to it's size and power, this is the ideal replacement engine for 5.0L, 5.7L, 5.0 MPI, and 5.7 EFI engines that power cruisers, small boats, and large runabouts.

  • Dry-Joint Exhaust
  • 1-Year Factory Backed Limited Warranty
  • 2 Years of Mercury Product Protection Coverage Available


Power 300 HP (224 kW)
Full Throttle Range 4600-5000 RPM
Displacement 355 CID (5.8L)
Engine Type Remanufactured GM V8 Marine Iron Block & Gen+ Heads
Bore & Stroke 4.030" x 3.480" (102mm x 88mm)
Compression Ratio 9.4:1 with Hypereutectic Pistons
Rocker Arm Ratio 1.5:1
Fuel Requirement 87 Octane (R+M)/2
Fuel System MPI with Gen II Cool Fuel
Induction System 2-piece Long Runner Intake with 75mm Throttle Body
Control System ECM 555 with SmartCraft CAN Capability
Ignition System Crank-fired High Voltage Switch w/Knock Control & Platinum Plugs
Charging System 65 Amp / 917 Watt Alternator
Water Drain System Multi-Point Drain - Hand Removable Blue Drain Plugs
Exhaust System Iron Manifold with Dry-Joint Exhaust Elbow
Cooling System Thermostatically Controlled Raw Water - 160 F*
Accessory Drive System Serpentine Belt
Lubrication System High Flow Oil Pump
Reccomended Engine Oil SAE 25-40 NMMA Certified FC-W Synthetic Blend
Audio Warning System Oil Pressure, Coolant Temperature, Drive Lube, Water Pressure
Alpha Ratios 1.47:1 / High Altitude 1:81:1
Dimensions (LxWxH) 32" x 30" x 22" (814mm x 740mm x 559mm)
Engine Weight (lbs./kg) 932 / 423
Optional Fresh Water Cooling Dealer Installed Kit
Boat Harness Type 10-pin


*Requires addition of Seawater pump kit if used with Gen I Alpha Drive