Mercury 350XXXL 350HP – Verado V10 35″ Shaft DTS Electric Start in Black

Mercury 350XXXL 350HP Verado V10 Ultra-Long

The Mercury 350XXXL Verado is a specialized 350HP FourStroke outboard engineered for offshore ultra-high transom vessels requiring the industry-first naturally aspirated V10 architecture in the US offshore market. Built upon a 5.7L Dual Overhead Cam (DOHC) powerhead and weighing 695 lbs, this engine features a rare 35-inch ultra-long shaft for maximum hydrodynamic authority. Our dependable outboard propulsion systems is designed to support the displacement-driven torque and digital precision required for the heaviest offshore center consoles and walkarounds. Operational peak performance for the Mercury 350HP V10 occurs between 5800 and 6400 RPM, supported by a class-leading 150 Amp alternator for superior electrical capacity. The 2.08:1 gear ratio translates the 5.7L torque curve into consistent thrust on offshore hulls. Manufactured in the USA, this corrosion-resistant marine engine incorporates SmartCraft Digital Throttle & Shift (DTS) and an integrated High-Output Electric/Hydraulic power steering system to helps support an incredibly smooth experience across deep ocean swells.

offshore 35-Inch Shaft Propulsion

The 35-inch ultra-long shaft is the defining feature of this model, purposefully designed for offshore transom heights where standard long-shaft motors would lose hydrodynamic grip. This configuration prevents cavitation in ocean swells and helps support consistent forward thrust on the largest deep-V hulls navigating the American coastal environment.

5.7L V10 Naturally Aspirated Advantage

The 5.7L V10 platform leverages a naturally aspirated DOHC design to provide the smooth, reliable torque that offshore Boaters use. This “displacement over forced induction” philosophy translates to durability, instantaneous low-end grunt for hauling heavy fuel loads, and incredibly smooth power delivery during high-speed offshore runs.

Mercury 3-Year Protection

Every Mercury 350XXXL 350HP Verado V10 outboard is backed by a comprehensive 3-Year Limited Warranty for American owners. This factory-level protection helps support long-term peace of mind and grants access to genuine parts through a vast nationwide marine dealer network.

Maintenance & Longevity

Maintaining clean oil in the Mercury 350XXXL 8.0L integrated wet sump lubrication system is vital for preserving tight engine tolerances over time. Always flush the cooling system with fresh water after every saltwater outing.Pro Tip from the Shop:Because 35-inch shaft engines are often part of complex multi-engine setups, strictly monitor the NMEA Gateway for system-wide digital health and regularly grease the heavy-duty steering tube to helps support smooth operation in high-stress offshore environments.