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383 MAG Inboard 4V
340 Crankshaft Horsepower
There is finally the perfect engine to replace a 5.7L or 7.4L classic inboard. This engine delivers more torque than any standard 7.4L big block, and it does so while weighing 150 pounds less. Standard and opposite rotation versions are available, so you don't have to re-engineer your classic boat with a different type of transmission to make it go again.
- Full roller valvetrain reduces friction and saves on fuel
- 1-year factory backed limited warranty Available when purchased through any Mercury/MerCruiser authorized dealer
- Up to 2 years of Mercury Product Protection available
Resources
Specifications
| Part Number | Standard (LH) Rotation Part Number 8M0061212 - Transmission not included Opposite (RH) Rotation Part Number 8M0061213 - Transmission not included |
|---|---|
| Horsepower @ flywheel | 340 |
| Kilowatts @ flywheel | 254 |
| Maximum RPM (WOT) | 4600-5000 |
| Cylinders | Remanufactured GM V8 Marine Iron Block & Gen+ Heads - 062 Casting |
| Displacement (CID/L) | 383 / 6.3 |
| Bore & Stroke (in/mm) | 4.03 x 3.75in 102 x 95mm |
| Compression Ratio | 9.0:1 with Hypereutectic Pistons |
| Fuel Requirement | 87 octane (R+M)/2 |
| Engine Control System | Thunderbolt V w/Knock Control - MIE Calibration |
| Fuel Delivery System | 4V carburetor and mechanical fuel pump |
| Fuel Injection System / Carburetor Type | 750 cfm Weber 4V with electric choke |
| Induction System | Dual Plane Aluminum Intake Manifold with Bronze Inserts |
| Charging alternator amp | 65 |
| Charging alternator watt | 917 |
| 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 - 143F |
| Accessory Drive System | Serpentine belt |
| Lubrication System | High Flow 100 psi Oil Pump and Copper Oil Cooler |
| Recommended Oil | SAE 25-40 NMMA Certified FC-W Synthetic Blend |
| Rocker Arms | 1.6:1 Full Roller Aluminum |
| Length (in/mm) | 43in / 1092mm |
| Width (in/mm) | 29in / 737mm |
| Height (in/mm) | 22in / 559mm |
| Weight (lbs/kg) | 980lbs / 444kg - When Installed with 72C Transmission |
| Features & Related Products | Audio Warning System: - Oil Pressure - Coolant Temperature - Transmission Temperature |
