Mercury 400hp Verado V10 400XXXL

The Mercury 400hp Verado V10 400XXXL is purpose-built for extreme offshore applications where standard long, X-Long, or even XX-Long shafts are not enough. Featuring a 35” XXX-Long shaft, this model is ideal for very high-freeboard hulls, offshore catamarans, and specialized commercial or performance boats.

Powered by a 5.7L naturally aspirated V10, the 400XXXL delivers immense torque with smooth, linear acceleration, paired with SmartCraft® digital technologies for effortless control in rough water.

Features and Performance

• 5.7L V10 Naturally Aspirated Powerhead – Massive torque with predictable, linear delivery

• 400 Horsepower Output – Confident thrust for heavy offshore hulls

• 35” XXX-Long Shaft – Designed for the tallest transoms and extreme offshore platforms

• Digital Throttle & Shift (DTS) – Ultra-smooth shifting and instant throttle response

• Advanced MidSection (AMS) – Dramatically reduces vibration and engine noise

• Adaptive Speed Control – Holds RPM through swells, turns, and changing loads

• Precision Gearcase – Stable at high speed with authoritative low-speed control

Why You Should Buy It

• Longest-shaft Verado V10 400hp available

• Built for extreme offshore and high-transom boats

• Smooth, quiet, and refined for long offshore runs

• Premium digital control and handling confidence

• Backed by Mercury Marine with a 3-Year Factory Warranty

If your offshore platform demands maximum naturally aspirated power and a 35” shaft, the 400XXXL is engineered to deliver without compromise.

FAQ – Mercury 400hp Verado V10 400XXXL

Q1: Who needs a 35” XXX-Long shaft outboard?
Boats with extremely high transoms, offshore catamarans, or specialized commercial/performance hulls.

Q2: Is the 400 Verado supercharged?
No. It uses a naturally aspirated 5.7L V10, offering strong torque with simpler long-term ownership.

Q3: Is Digital Throttle & Shift included?
Yes. DTS is standard equipment on Verado V10 models.

Q4: Can the 400XXXL be used in multi-engine setups?
Yes. It is commonly used in twin or triple Verado configurations for large offshore boats.