New Quicksilver MerCruiser 350 Mag MPI Alpha 300 HP Engine 8m0136293 8M0187359

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All New Construction 350 MPI ALPHA – 8M0136293 ss to 8M0187359

300 HP @ 4600-5000 RPM

Get the fuel injected V8 engine you always wanted for your sterndrive runabout. This is the perfect repower for: 5.0L, 5.7L, and 350 carbureted and fuel injected engines. Quicksilver’s engine provides cast iron durability with exclusive Black-X valve technology and is compatible with SmartCraft digital gauges.

  • Remote Oil Filter
  • Gen II cool fuel system
  • Dry-Joint exhaust system
  • Requires addition of dealer installed seawater pump kit if used with Gen I Alpha drives

350 MPI ALPHA Alpha Engine Only. 300 HP @ 5000 RPM. 350 Cubic Inch Fully Dressed Marine Engine. Engine Features 100% new Quicksilver: Cast Iron Engine Block, Raw Water Cooling with Warm Exhaust Manifolds, Flush System, Special Flame Graphics, Multi-Port Fuel Injection using Cool fuel II, Dry Joint Exhaust, Roller Camshaft, Quicksilver Cast Iron Cylinder Heads featuring Black-X Valve Tech, 1.5:1 stamped rocker arms, ECM555, Engine Guardian, SmartCraft Ready, Mechanical Throttle and Shift, and 10-Pin Harness. 3-Years of Limited Factory Warranty. Runs on 87 Octane Fuel.
NOTE: If used with an Alpha One (Gen I) drive, this engine requires Seawater Pump Kit 46-8M0139983 & serpentine belt 57-865615Q03 (sold separately) for proper cooling.

Warranty Information




Engine Size:

Small Block V8

Horse Power:


Drive Type:


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