357 Alpha 4V 275HP

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Don't just repower--power up! The world famous 357 Alpha will breathe new life into your runabout, sport boat, or pontoon boat when replacing a 4.3L, 5.0L, or 5.7L engine.

  • V-8 Remanufactured Iron Marine Block
  • 1-Year Factory Backed Limited Warranty
  • 2 Years of Mercury Product Protection Coverage Available


Power 275 HP (205 kW)
Full Throttle Range 4400-4800 RPM
Displacement 357 CID (5.8L)
Engine Type Remanufactured GM V8 Marine Iron Block & Gen+ Heads
Bore & Stroke 4.040" x 3.480" (103mm 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 Weber 750 cfm 4V Electric Choke Carburetor & Mechanical Fuel Pump
Induction System Dual Plane Aluminum Intake Manifold with Bronze Inserts
Ignition System Thunderbolt V with Knock Control
Charging System 65 Amp / 917 Watt Alternator
Water Drain System Multi-Point Drain - Hand Removable Blue Drain Plugs
Exhaust System Iron Manifold with Wet-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
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) 871 / 395
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