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The QUAD SET 2019 Mercury 350 HP Verado is a four-engine high-horsepower outboard package built around Mercury’s supercharged 2.6-liter inline-six Verado platform. Four 350 HP engines provide a combined rated output of 1,400 HP, making this configuration intended for large, high-performance multi-engine boats where substantial propulsion, acceleration and offshore capability are required.
The 2019 Mercury 350 Verado uses a 2.6L inline-six powerhead with 24-valve DOHC architecture, supercharged induction with charge-air cooling, electronic boost-pressure control and sequential multi-port electronic fuel injection. Mercury’s 2019 specifications list a 5,800–6,400 RPM full-throttle range, SmartCraft digital compatibility, Smart Start electric starting and electro-hydraulic power steering.
| Specification | Per 350 Verado | Quad Set |
|---|---|---|
| Rated horsepower | 350 HP / 257 kW | 1,400 HP combined |
| Engine type | Inline 6-cylinder | Four engines |
| Displacement | 2.6 L / 2,598 cc | 10.4 L combined displacement |
| Induction | Supercharged, charge-air cooled | Four supercharged engines |
| Fuel system | Sequential multi-port EFI | Four EFI systems |
| Full-throttle RPM | 5,800–6,400 RPM | Same per engine |
| Alternator | 70 A / 882 W belt-driven | 280 A / 3,528 W nominal combined output |
| Starting | Smart Start electric | Four electric-start systems |
| Steering | Electro-hydraulic power steering | Multi-engine steering system |
| Gear ratio | 1.75:1 | Same per engine |
| Gearcase | 5.44-inch | Four gearcases |
| Dry weight | Approx. 668 lb / 303 kg, lightest model | Approx. 2,672 lb / 1,212 kg before rigging and other equipment |
| Shaft options | 20 / 25 / 30 in | Configuration dependent |
| Trim system | Power trim and tilt | Four independent systems |
| SmartCraft | Compatible | Integrated multi-engine monitoring |
Mercury’s 2019 catalogue identifies the 350 Verado as a 2.6L inline-six producing 350 HP, with a 5,800–6,400 RPM full-throttle range, supercharged charge-air-cooled induction, Smart Start electric starting, a 1.75:1 gear ratio, 70-amp alternator and approximately 303 kg/668 lb dry weight for the lightest model.
Each 2019 Mercury 350 Verado uses a 2.6-liter inline-six engine. The six-cylinder layout is paired with a 24-valve DOHC valvetrain and forced induction. Mercury’s published specifications identify the bore and stroke as approximately 92 × 86 mm.
For a quad installation, the four powerheads operate as separate engines but work together through the boat’s controls, steering and instrumentation. Correct rigging is therefore especially important: the engines need to be correctly positioned, synchronized and configured for the hull.
The 350 Verado’s supercharged induction system is designed to deliver high airflow and strong power throughout the operating range. Mercury specifies charge-air cooling and electronic boost-pressure control for this generation of 350 Verado.
With four engines, the installation places significant demands on fuel delivery, electrical systems, cooling-water flow, steering and control integration. The boat and rigging system must be designed for the combined output rather than treating the engines as four independent installations.
Each 350 Verado uses sequential multi-port electronic fuel injection. EFI provides electronically controlled fuel delivery across the operating range and integrates with Mercury’s engine-management and SmartCraft systems.
For a used quad set, inspection should include fuel-system condition, injectors, wiring, connectors, batteries, grounds and engine-management diagnostics. Matching service history across all four engines is also valuable because the engines may have accumulated different operating hours.
The 2019 350 Verado is compatible with Mercury SmartCraft digital technology. A properly configured multi-engine installation can use SmartCraft-compatible displays and controls to monitor engine information and system status.
When inspecting or installing a quad set, verify that the controls, displays, harnesses, modules and steering equipment are compatible with the specific engine serial numbers. Do not assume that every SmartCraft component is interchangeable across generations.
Mercury lists electro-hydraulic power steering for the 350 Verado. A four-engine installation requires a steering system engineered for the complete engine array, transom arrangement and boat design.
Steering inspection should include hydraulic lines, fittings, pumps, mounting hardware and steering response. Any evidence of leakage, abnormal steering effort or loose engine mounting should be resolved before high-speed operation.
Mercury identifies counter-rotation as available for the 350 Verado. In a quad configuration, the exact left-hand/right-hand engine arrangement should follow the boat manufacturer’s and Mercury’s rigging requirements.
Counter-rotating propellers can be part of a multi-engine setup intended to manage steering forces and optimize propulsion behavior. The correct engine positions and propeller specifications must be confirmed for the particular hull rather than assumed from a generic quad layout.
The 2019 350 Verado uses a 1.75:1 gear ratio with a 5.44-inch gearcase specification. Propeller selection should be based on the boat’s hull, engine spacing, expected load, target RPM and intended operating profile.
For four engines, all four propeller selections and engine positions should be treated as a coordinated system. A water test at normal operating load should verify that each engine reaches the appropriate 5,800–6,400 RPM full-throttle range.
A four-engine 350 Verado package is suited to large offshore and high-performance boats designed for multiple high-horsepower outboards. Applications can include large center consoles, offshore fishing boats, performance cruisers and other vessels engineered for very high combined horsepower.
The boat must be specifically rated and structurally designed for the combined power and approximately 1,212 kg/2,672 lb of engine dry weight before additional rigging, controls, batteries, steering equipment and propellers are included.
A quad installation should begin with the boat manufacturer’s maximum horsepower and transom-weight requirements. The transom must accommodate four engine mounting systems and the associated steering and rigging loads.
A quad set requires substantially more fuel-system capacity and electrical planning than a single outboard. Each 350 Verado has a 70-amp/882-watt belt-driven alternator specification, so the four engines provide substantial combined charging capacity, but the complete boat electrical architecture still needs to be correctly engineered.
Fuel lines, filters, tanks, pumps and ventilation should be sized for the combined engine demand according to applicable installation requirements. Battery banks and starting circuits should likewise be designed for four Smart Start electric-start engines.
Mercury lists the lightest 350 Verado configuration at approximately 668 lb / 303 kg dry. Four engines therefore represent approximately 2,672 lb / 1,212 kg of engine weight alone.
Actual installed weight will be higher after adding propellers, rigging, steering components, batteries, fuel-system components and other equipment. Center-of-gravity calculations are important because the engines sit at the extreme aft end of the boat.
Maintaining four Verado engines requires a coordinated service schedule. Engine oil, filters, gearcase lubricant, spark plugs, fuel-system components, cooling systems, belts, electrical connections and steering equipment should all be inspected according to the applicable Mercury service schedule.
For a used quad set, compare the service history of all four engines. Ideally, obtain serial numbers, engine-hour information and diagnostic reports for each engine rather than relying on the history of only one motor.
Before purchasing a used quad set, document the serial number and model information for every engine. Confirm shaft length, rotation configuration, engine hours, service history, control system and included rigging.
Inspect each lower unit independently for impact damage, corrosion, lubricant contamination and propeller damage. The powerheads should also be checked for corrosion, leaks, abnormal noises and evidence of previous repairs.
A professional diagnostic inspection and water test are particularly valuable with a four-engine package. Differences in engine hours, operating data or compression between the four engines should be investigated before purchase.
The 2019 350 Verado should not be confused with Mercury’s newer V10 350 Verado. The 2019-era engine covered here is the 2.6L supercharged inline-six platform, while Mercury’s current 350–425 HP Verado family uses a 5.7L V10 platform.
| Feature | 2019 350 Verado | Newer V10 350 Verado family |
|---|---|---|
| Engine architecture | Inline 6 | V10 |
| Displacement | 2.6 L | 5.7 L |
| Induction | Supercharged, charge-air cooled | Modern V10 Verado platform |
| Model generation | 2019-era L6 Verado | Newer generation |
Four 350 HP engines provide a combined rated output of 1,400 HP.
The 2019 350 Verado uses a 2.6-liter inline-six powerhead with 24-valve DOHC architecture and supercharged, charge-air-cooled induction.
Mercury’s specification lists a full-throttle operating range of 5,800–6,400 RPM.
The documented gear ratio is 1.75:1 with the 5.44-inch gearcase specification.
Mercury lists approximately 668 lb / 303 kg dry for the lightest configuration. Four engines therefore represent approximately 2,672 lb / 1,212 kg before additional rigging and equipment.
Yes. The 2019 specification identifies SmartCraft digital technology compatibility and SmartCraft digital controls.
Yes. Mercury specifies supercharged induction with charge-air cooling and electronic boost-pressure control.
Check the serial number, hours, service history, diagnostic data, compression where appropriate, lower units, propellers, steering system, electrical system, rigging and water-test performance for each of the four engines.
The QUAD SET 2019 Mercury 350 HP Verado combines four supercharged 2.6-liter inline-six Verado outboards for a total rated output of 1,400 HP. With SmartCraft compatibility, electro-hydraulic steering, power trim and tilt and multiple shaft configurations, the package is designed for large boats engineered around multiple high-output outboards.
Before purchase or installation, verify the exact model and serial numbers, shaft lengths, rotation arrangement, rigging included with the set, engine hours and service history. For additional marine propulsion options, browse our outboard engines category.
