383 MAG Bravo 4V 350HP


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30.00 (in)
22.00 (in)
32.00 (in)
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The ideal replacement engine for 454HO and 502HO carbureted engines that power cruisers, large runabouts, and sport boats.

  • More Torque than a 454 HO Carbureted Engine
  • 1-Year Factory Backed Limited Warranty
  • 2 Years of Mercury Product Protection Coverage Available


Power 350 HP (261 kW)
Full Throttle Range 4800-5200 RPM
Displacement 383 CID (6.3L)
Engine Type Remanufactured GM V8 Marine Iron Block & Gen+ Heads - 062 Casting
Bore & Stroke 4.030" x 3.750" (102mm x 95mm)
Compression Ratio 9.0:1 with Hypereutectic Pistons
Rocker Arm Ratio 1.6:1 Full Roller
Fuel Requirement 87 Octane (R+M)/2
Fuel System Weber 750 cfm 4V Electric Choke Carburetor & Electrical 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 Dry-Joint Exhaust Elbow
Cooling System Thermostatically Controlled Raw Water - 143 F
Accessory Drive System Serpentine Belt
Lubrication System High Flow Oil Pump and Copper Engine Oil Cooler
Reccomended Engine Oil SAE 25-40 NMMA Certified FC-W Synthetic Blend
Audio Warning System Oil Pressure, Coolant Temperature, Drive Lube
Bravo One Ratios 1.50:1, 1.65:1
Bravo Two Ratios 1.81:1, 2.00:1, 2.20:1
Bravo Three Ratios 1.81:1, 2.00:1, 2.20:1
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