350 MPI Alpha 300HP

(No reviews yet)
30.00 (in)
22.00 (in)
32.00 (in)
Current Stock:
Adding to cart… The item has been added


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