2026 Mercury Racing 520 Engine Package w/ XR-1 SternDrive

Mercury Racing 520 Engine

High-Performance Sterndrive Power Made Accessible
The Mercury Racing 520 engine brings true race-bred performance to recreational boaters seeking uncompromising power and value. Positioned perfectly between the MerCruiser 8.2L MAG HO and the legendary Mercury Racing 525 EFI, this 520 hp Mercury Racing engine delivers exceptional acceleration, mid-range punch, and reliability in a complete sterndrive package.

Built for enthusiasts who demand premium performance without race-fuel requirements, the Mercury Racing 520 sterndrive runs on standard 87-octane pump gas while still producing a massive 520 horsepower.

8.6L V8 Performance with Advanced EFI

At the heart of this package is a naturally aspirated 8.6-liter (523 CID) V8 featuring Mercury Racing cylinder heads, CNC-machined block, and multi-port electronic fuel injection. An electronic throttle body combined with DTS ensures crisp response and smooth control throughout the RPM range.

Performance features include:

• 520 HP naturally aspirated V8 output

• 523 cubic inches (8.6L) displacement

• Multi-port fuel injection system

• Electronic throttle body & DTS control

• Nearly 100 HP more than the 430 MAG HO

• Broad torque band for superior hole shot and mid-range power

For boaters ready to buy Mercury Racing 520 engine packages, this platform delivers unmatched strength and drivability.

XR-1 SternDrive & Mercury Racing Engineering

The package is paired with the rugged Bravo-1 XR SternDrive, designed to handle high torque loads and aggressive boating conditions. Precision-balanced forged crankshaft components and CNC-machined internals ensure durability at sustained high output.

Engineering advantages:

• Bravo-1 XR high-performance stern drive

• Forged micro-alloy crankshaft, induction hardened

• Precision CNC cast-iron cylinder block

• Large 4.560″ cylinder bores for increased torque

• Closed-cooling system with 5-year coolant

• Thermostatically controlled oil system with high-capacity cooler

This Mercury Racing 520 XR-1 SternDrive setup is built for consistent performance and long-term reliability.

Smart Protection & Emissions Compliance

Mercury Racing equips the 520 with its advanced Engine Guardian System and individual-cylinder PCM management for optimal performance and protection under all conditions. The engine complies with both EPA and CARB emissions standards, making it legal and ready for use in regulated waters.

Technology highlights:

• Engine Guardian System for protection

• PCM fuel & spark control per cylinder

• Faster oil warm-up and temperature stability

• EPA & CARB compliant

• Backed by a 2-year factory warranty

Whether you’re upgrading or building new, the Mercury Racing 520 V8 sterndrive is the ultimate blend of power, technology, and value.