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The Mercury MerCruiser 6.2L 350 HP ECT inboard engine is a high-output gasoline V8 marine engine for boats that require 350 horsepower from a compact 6.2-liter platform. Performance Engines lists this product as a new 2025 Mercury 350 HP ECT 6.2L inboard engine, intended for inboard propulsion and suitable for appropriate repower and performance-oriented recreational applications.
Mercury’s 6.2L inboard platform is offered in 300 and 350 HP configurations. The 350 HP version produces 261 kW, uses a 6.2-liter V8 with multi-port electronic fuel injection, and is specified for a wide-open-throttle range of 5,000–5,400 rpm. Mercury’s published technical information also identifies the ECT version within the 6.2L MPI family.
The Mercury 6.2L 350 is rated at 350 HP / 261 kW and has a published wide-open-throttle range of 5,000–5,400 rpm. Mercury describes the 6.2L inboard platform as optimized for marine duty, with torque intended to help inboard boats get on plane.
Actual boat performance depends on hull design, displacement, propeller selection, transmission ratio, loading and operating conditions. Horsepower alone should not be used to determine whether an engine is suitable for a particular vessel.
The 350 HP model uses a 6.2-liter V8 with a pushrod valve train and two valves per cylinder. Mercury lists a 4.0-inch / 101.6 mm bore and 3.75-inch / 95.25 mm stroke, giving the engine its 377 cubic-inch / 6.2-liter displacement.
The V8 configuration provides eight cylinders within a relatively compact inboard package. For repower work, however, physical dimensions, mounting locations, exhaust arrangement and drivetrain compatibility must be checked against the existing installation.
Mercury uses computer-controlled Multi-Port Electronic Fuel Injection (MPI) on the 6.2L 350. The MPI system manages fuel delivery to the individual intake ports, while Mercury’s performance-tuned scroll intake manifold supports the engine’s air-induction system.
The system is designed around electronic engine management rather than a carbureted fuel system. Fuel quality, filtration, electrical supply and correct engine-control integration are therefore important parts of a professional installation.
The 6.2L 350 uses SmartCraft PCM 112 electronic engine management. Mercury’s SmartCraft system integrates engine information and control functions, while Engine Guardian provides protective monitoring for supported engine conditions.
Mercury also identifies SmartCraft digital technologies as part of the 6.2L inboard platform. The exact control and display functions available depend on the engine configuration and connected SmartCraft equipment.
The Mercury 6.2L 350 uses a 70-amp belt-driven alternator. Mercury’s current 6.2L inboard information describes 70 amps of charging output at wide-open throttle.
Alternator output is only one part of the vessel’s electrical design. Battery capacity, cable sizing, circuit protection, charging requirements and the boat’s total electrical load should be evaluated during installation.
The 6.2L platform uses a marine cooling arrangement designed to manage engine temperature in an inboard installation. Mercury’s current product information describes the engine as optimized for marine duty, while published 6.2L specifications identify fresh-water cooling as available with the SeaCore option and a thermostatically controlled water-cooled configuration.
For a saltwater installation, confirm the exact cooling configuration supplied with the engine and any SeaCore-related equipment before ordering. Cooling-system configuration should not be assumed from the engine name alone.
| Specification | Mercury MerCruiser 6.2L 350 ECT |
|---|---|
| Manufacturer | Mercury Marine |
| Engine family | MerCruiser 6.2L Inboard |
| Rated power | 350 HP / 261 kW |
| Engine type | V8, 2-valve-per-cylinder pushrod |
| Displacement | 6.2 L / 377 CID |
| Bore | 4.0 in. / 101.6 mm |
| Stroke | 3.75 in. / 95.25 mm |
| WOT range | 5,000–5,400 rpm |
| Fuel delivery | Computer-controlled Multi-Port Electronic Fuel Injection (MPI) |
| Air induction | Performance-tuned scroll intake manifold |
| Engine management | SmartCraft PCM 112 |
| Alternator | 70A / 882W belt-driven |
| Lubrication | Integrated wet sump |
| Engine protection | SmartCraft Engine Guardian |
| Dry weight | Approximately 862 lb / 391 kg engine only |
| Published dimensions | Approximately 32 × 30 × 22 in. / 813 × 762 × 559 mm |
| Condition listed by Performance Engines | New |
| Product year listed by Performance Engines | 2025 |
The product is specifically listed as a 350 HP ECT model. Mercury technical documentation identifies 6.2 MPI ECT and non-ECT configurations and provides performance specifications for the 350 HP version.
Because Mercury has offered different 6.2L configurations across model years and markets, buyers should verify the exact emissions configuration, serial-number specification and supplied equipment for the engine being purchased. This is particularly important when installing an engine in a regulated market or replacing an older engine.
Published Mercury specifications for the 6.2L 350 identify compatible transmission and drive configurations and multiple reduction ratios depending on the installation. The exact ratio must be matched to the vessel, propeller and intended operating range rather than selected from horsepower alone.
Before a repower, confirm the existing transmission, output shaft, coupler, propeller dimensions, rotation requirements and engine-mount arrangement. A marine technician should verify the complete drivetrain before the engine is installed.
Published 6.2L 350 specifications give an engine-only size of approximately 813 × 762 × 559 mm and an engine-only dry weight of approximately 391 kg / 862 lb.
These measurements are useful for initial planning, but the complete installed package can require additional clearance for exhaust, cooling connections, electrical connections, controls and service access. Measure the existing engine compartment before ordering a replacement.
Published Mercury specifications list unleaded regular gasoline with a minimum of 87 octane (R+M)/2 or 90 RON, with fuel ethanol tolerance up to 10 percent for the referenced configuration.
Fuel requirements can vary by market and model-year configuration. Always follow the fuel specification supplied with the actual engine and use an appropriate marine fuel system for the installation.
The Mercury 6.2L platform is identified by Mercury as a repower option for replacing older 5.7L or 6.2L V8 engines.
A successful repower requires more than matching horsepower. Check engine-bed dimensions, mounting points, shaft or drive alignment, transmission ratio, propeller, exhaust routing, fuel delivery, electrical connections, controls and available service clearance.
Mercury highlights redesigned service access on the current 6.2L inboard platform, with service points positioned for easier access. The engine uses an integrated wet-sump lubrication system and a belt-driven alternator.
Maintenance should follow Mercury’s service documentation for the exact engine configuration. Oil, filters, belts, cooling components, fuel-system components and electrical connections should be inspected at the manufacturer’s specified intervals.
The Mercury 6.2L 350 HP is intended for suitable inboard recreational boats, performance boats and repower applications where a 350 HP gasoline V8 fits the vessel’s propulsion requirements.
Before purchasing, confirm the boat manufacturer’s recommended horsepower range, engine compartment dimensions, drivetrain configuration, fuel system, exhaust arrangement and applicable regulatory requirements.
The 6.2L 350 combines a 350 HP V8 with MPI fuel injection, SmartCraft electronic management, a 70A alternator and marine-specific systems. Mercury’s current 6.2L platform is offered in 300 and 350 HP configurations and is specifically designed for inboard marine use.
For buyers comparing inboard engines, the key decision points are not just horsepower. Engine dimensions, weight, transmission, propeller, fuel system, controls, cooling configuration and service requirements all need to match the vessel.
The Mercury 6.2L 350 is rated at 350 HP / 261 kW, with a published wide-open-throttle range of 5,000–5,400 rpm.
It is a 6.2-liter V8 MerCruiser inboard gasoline engine using multi-port electronic fuel injection. The product listing identifies this unit specifically as the 350 HP ECT version.
Published specifications list an engine-only dry weight of approximately 862 lb / 391 kg. The complete installed propulsion system can weigh more depending on the transmission and associated equipment.
Published specifications give approximately 32 × 30 × 22 inches, or about 813 × 762 × 559 mm. Installation clearance must also account for hoses, wiring, exhaust, controls and service access.
The referenced Mercury specification lists unleaded regular gasoline at a minimum of 87 octane (R+M)/2 or 90 RON, with up to 10 percent ethanol tolerance. Verify the exact fuel requirement for the engine’s model year and market before installation.
Yes. Mercury specifies computer-controlled Multi-Port Electronic Fuel Injection (MPI) for the 6.2L 350 platform.
Published specifications identify a 70A / 882W belt-driven alternator. Mercury’s current 6.2L product information also describes 70 amps of charging output at wide-open throttle.
Mercury identifies the 6.2L V8 as a repower option for older 5.7L and 6.2L V8 engines. Suitability for a particular boat must still be confirmed from the vessel’s horsepower rating, engine-bay dimensions, drivetrain, fuel system, controls and applicable requirements.
The Mercury 350 HP ECT 6.2L Inboard Engine provides a 350 HP V8 marine platform with MPI fuel injection, SmartCraft electronic management, a 70A alternator and marine-specific cooling and control systems. It is listed by Performance Engines as a new 2025 product for suitable inboard applications.
Before purchasing, verify the exact engine configuration, transmission, dimensions, fuel requirements, controls, cooling arrangement and emissions specification against your boat. For another Mercury inboard option, compare the Mercury 250 HP ECT 4.5L Inboard Engine, Mercury 230 HP 3.0L Inboard Diesel Engine and Mercury 370 HP 6.2L Jet Inboard Engine.
Explore more inboard engines at Performance Engines.
