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Mercury 400CXXXL 400HP – Verado V10 35″ Shaft Counter Rotation DTS in Black
During extreme offshore runs across deep-transom center consoles, the Mercury 400CXXXL Verado V10 powerplant deploys a 5.7-liter naturally aspirated DOHC engine, counter-rotation DTS controls, a 150A alternator, and an ultra-deep 35-inch shaft for quad-engine platforms.
- 5.7L V10 powerhead produces 400HP output
- 35-inch ultra-long shaft fits deep hulls
- Counter-rotation lower unit balances quad-engine tracking
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Description
Mercury 400CXXXL 400HP Verado V10 DTS
The Mercury 400CXXXL Verado pairs a naturally aspirated 5.7L V10 with a 35-inch ultra-long shaft and counter-rotation gearing, built for the port-side position in the largest multi-engine offshore rigs. At 695 lbs, this DOHC powerhead delivers the displacement-driven torque and digital precision offshore captains need on the deepest transoms.
Peak output runs between 5800-6400 RPM, backed by a 150-Amp alternator. The 2.08:1 gear ratio holds that 5.7L torque curve steady on extreme hulls. Built in the USA, this engine pairs SmartCraft Digital Throttle & Shift (DTS) with integrated electro-hydraulic power steering across deep ocean swells.
Technical Specifications of Mercury 400CXXXL Verado
| Engine type | V10 5.7L Dual Overhead Cam (DOHC) |
|---|---|
| Displacement | 5.7 Liters (349 cu in) |
| Horsepower | 400hp @ 6000 RPM |
| Full-throttle rpm range | 5800 – 6400 RPM |
| Rotation | Counter Rotation (Left-Hand) |
| Alternator output | 150 Amps (1890 Watt) |
| Gear ratio | 2.08:1 |
| Shaft length | 35 inch |
| Dry weight | 695 lbs (316 kg) |
| Digital Control | SmartCraft DTS (Digital Shift & Throttle) |
Extreme 35-Inch Shaft Propulsion
The 35-inch ultra-long shaft is built for transom heights where a standard long-shaft motor would ventilate. That length keeps the prop biting on the largest deep-V hulls through massive ocean swells during long-range transits.
Naturally Aspirated V10 Displacement
The 5.7L V10 skips forced induction in favor of raw displacement, which keeps power delivery smooth and predictable rather than peaky — a real advantage for durability and steady low-end torque hauling heavy fuel loads.
150A High-Output Charging
A 150-Amp alternator generating 1890 Watts covers the electrical load of modern offshore rigs, keeping radar, stabilizers, and multiple large navigation screens running without draining house batteries on long transits.
Mercury 3-Year Protection
Every Mercury 400HP Verado V10 carries a 3-year limited factory warranty, with genuine parts available through Mercury’s nationwide dealer network.
Maintenance & Longevity
Keeping the 8.0L wet sump lubrication system topped off with clean oil protects engine tolerances over time, and the cooling system needs a fresh-water flush after every saltwater outing. Pro Tip from the Shop: on 400CXXXL units running as part of a quad-engine setup, keep an eye on the NMEA Gateway for system-wide diagnostics and grease the steering tube regularly — both take extra wear in that configuration.
Mercury 400CXXXL 400HP Verado V10 Specs (Black)
| Brand | Mercury Marine |
| Model Name | Verado V10 400HP (Counter) |
| Part Number/SKU | 400CXXXL |
| Technology Category | V10 Naturally Aspirated 4-Stroke |
| Engine Architecture | V10 5.7L Dual Overhead Cam (DOHC) |
| Shaft Length | 35-Inch (Ultra-Long) |
| Rotation | Counter Rotation (Left-Hand) |
| Full Throttle RPM | 5800-6400 RPM |
| Fuel Induction | Electronic Fuel Injection (EFI) |
| Alternator Output | 150 Amps |
| Steering | Integrated High-Output Electric/Hydraulic |
| Trim System | Power Trim & Tilt |
| Gear Ratio | 2.08:1 |
| Digital Control | SmartCraft DTS (Digital Shift & Throttle) |
| NMEA Interface | SmartCraft NMEA Gateway Compatible |
| Dry Weight | Approx. 316 kg (695 lbs) |
| Country of Origin | USA |
| Standard Warranty | 3-Year Limited / 3-Year Corrosion |
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