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525 EFI (500-hp)

Brief Summary

This all-new sterndrive engine features custom Edelbrock aluminum cylinder heads, designed exclusively for Mercury Racing, closed cooling, new stainless steel CMI tubular “sweeper” headers and the exclusive Mercury Propulsion Control Module (PCM) 555. The results? Higher horsepower and a higher torque band throughout the engine operating rpm range.

Key Features

  • Precision CNC machined 502 C.I.D. cast iron cylinder block.
  • Advanced, factory installed closed-cooling system features five-year coolant for reduced maintenance and increased corrosion protection.
  • Custom electronic gauge interface module, designed by Mercury Racing, allows for operation of either analog or digital instrumentation.
  • Multiport fuel injection system incorporates a high-flow throttle body and flame arrestor developed exclusively by Mercury Racing.
  • Water-cooled fuel system works in concert with a low pressure and high pressure fuel pump to keep fuel temperatures at optimum levels while reducing t
  • A thermostatically controlled, high-capacity oil cooler raises engine oil temperatures faster and keeps them more consistent.
  • A hydraulic roller camshaft and an idle air valve, located at the rear of the intake plenum, work in concert to improve engine idle quality.
  • Custom Edelbrock aluminum cylinder heads, designed exclusively for Mercury Racing, enhance torque and overall performance.
  • Dual-water pickup and low-water pickup gearcase housings for Bravo One XZ and standard Bravo One XR drives.


Type of Engine
Number of Cylinders 8
Horse Power 500
Configuration V-8
Weight 1201.00lbs
Fuel Type Gasoline
Fuel Delivery
Shaft Length Options
Shift Throttle Control
Displacement 502.00cu in
Steering Control
Recommended Fuel
Alternator Output 65 amp
CARB Rating
Engine Monitoring System

Captain's Report