2019 Mercury Racing 450R 450HP Outboard Motor is a high-performance marine engine advertised with approximately 370 hours, a 25-inch shaft, right-hand rotation, and a very clean condition. The seller describes this complete motor as a “bolt on and go” option for a compatible vessel.
Powered by Mercury Racing’s supercharged 4.6-liter V8 four-stroke engine, the 450R is engineered to deliver substantial horsepower, strong acceleration, and responsive performance for demanding high-performance marine applications. Its supercharger and charge-air cooling system are designed to deliver pressurized intake air and support the engine’s 450HP output.
The Mercury Racing 450R uses a 64-degree V8 architecture with double overhead camshafts and 32 valves. Its performance-focused design includes electronic boost control, twin charge-air coolers, and a high-capacity oil cooling system. These features are intended to support power delivery and engine performance under demanding operating conditions.
This particular engine is advertised with a 25-inch XL shaft and right-hand rotation. Correct shaft length and rotation are important for compatibility with the vessel, especially on twin-engine installations. Verify both specifications from the engine identification plate before purchasing.
The 450R range was available with different gearcase configurations, including SportMaster and 5.44-inch Heavy Duty options. The exact lower unit fitted to this engine has not been identified in the supplied listing, so buyers should confirm the gearcase type, gear ratio, and service history.
The seller describes the motor as very clean and reports approximately 370 engine hours. While these details provide useful information, operating hours alone do not establish mechanical condition. Review the service history and arrange an appropriate inspection before completing the purchase.
The seller also describes the motor as complete and “bolt on and go.” Confirm precisely which controls, steering components, propeller, wiring, mounting hardware, and other rigging are included, along with compatibility requirements for your vessel.
The 2019 Mercury Racing 450R 450HP Outboard Motor is an option for experienced performance boat owners seeking supercharged V8 power with a 25-inch shaft and right-hand rotation.
Product Specifications
Brand: Mercury Marine / Mercury Racing
Model: 450R
Model Year: 2019
Horsepower: 450 HP
Engine Type: Supercharged Four-Stroke
Engine Configuration: 64-Degree V8
Displacement: 4.6L / 279 cubic inches
Valvetrain: DOHC, 32 Valves
Induction System: Supercharger with Charge-Air Cooling and Electronic Boost Control
Fuel Requirement: Minimum 89-octane gasoline (R+M/2), according to published Mercury Racing specifications
Full-Throttle Operating Range: 5,800–6,400 RPM
Shaft Length: 25 inches / XL shaft, according to seller
Rotation: Right-hand (RH), according to seller
Gearcase: Confirm whether SportMaster or 5.44-inch Heavy Duty
Gear Ratio: Depends on fitted gearcase; 1.60:1 is available on select SportMaster configurations
Charging System: 115A / 1,449W, according to published 450R specifications
Starting System: Electric Start
Throttle and Shift: Digital Throttle & Shift compatible
Engine Hours: Approximately 370
Condition: Very clean, according to seller
Controls and Rigging: Confirm exact included components
Warranty: Not specified by seller
Specifications are based on Mercury Racing 450R family information. Exact weights, gear ratio, and equipment depend on the fitted configuration.
Key Features
2019 Mercury Racing 450R 450HP outboard motor, supercharged 4.6L V8 four-stroke engine, 450HP performance, 64-degree V8 architecture, DOHC 32-valve design, charge-air cooling, electronic boost control, 25-inch XL shaft, right-hand rotation, approximately 370 hours, very clean condition according to seller, complete motor advertised, bolt-on-and-go description according to seller, designed for compatible high-performance marine applications.
Why Choose the 2019 Mercury Racing 450R 450HP Outboard Motor?
The 2019 Mercury Racing 450R 450HP Outboard Motor is designed for boat owners seeking high-output performance from a supercharged V8 marine engine.
Its 4.6-liter V8 powerhead and supercharging system are engineered to deliver strong acceleration and substantial power for compatible performance vessels. Mercury Racing developed the 450R for high-performance boating, combining specialized induction and cooling systems with a compact V8 package.
The advertised 25-inch shaft and RH rotation may suit compatible single-engine or right-hand configurations, subject to the boat’s exact setup. The seller also describes the engine as very clean, with approximately 370 hours.
Before purchasing, verify the engine’s service history, diagnostic information, compression or leak-down results where appropriate, exact gearcase, shaft length, rotation, and the rigging supplied.
Supercharged 4.6-Liter V8 Four-Stroke Engine
The Mercury Racing 450R uses a 4.6-liter V8 four-stroke engine with double overhead camshafts and 32 valves.
Mercury Racing’s supercharger uses a belt-driven twin-screw design to pressurize intake air, while charge-air coolers reduce the temperature of the compressed intake charge. Electronic boost control helps manage maximum boost in response to ambient conditions.
The published full-throttle operating range is 5,800–6,400 RPM. Correct propeller selection and engine setup are essential to operate within the appropriate range.
High-Performance Cooling and Engine Protection
The 450R incorporates charge-air cooling, a high-capacity oil cooler, and other cooling features designed for demanding engine operation.
These systems are intended to help manage engine temperatures when the motor is correctly installed and maintained. Buyers should request maintenance documentation and inspection results covering the cooling system, oil system, and other critical components.
25-Inch XL Shaft and Right-Hand Rotation
The 2019 Mercury Racing 450R 450HP Outboard Motor is advertised with a 25-inch shaft and right-hand rotation.
Shaft length and rotation direction must match the vessel and intended installation. This is particularly important for twin-engine boats, where the rotation and gearcase setup may affect steering, handling, and installation compatibility.
Confirm the complete model suffix, mounting arrangement, rotation, and transom requirements before purchase.
Gearcase Configuration
Mercury Racing offered the 450R with different gearcase options, including the SportMaster and 5.44-inch Heavy Duty gearcases.
The gearcase fitted to this particular motor has not been specified. Before completing the purchase, request confirmation of its model, gear ratio, shaft configuration, maintenance history, and condition.
The gearcase type can affect propeller selection, engine mounting, operating characteristics, and compatibility with the boat.
Approximately 370 Engine Hours
The seller reports approximately 370 operating hours on this engine.
Request any available service invoices, engine diagnostic records, maintenance history, and details of previous use. An independent inspection can help assess the powerhead, gearcase, cooling system, electrical system, and other important components.
Engine hours should be evaluated alongside service history and condition, particularly for a high-performance outboard.
Complete Motor and “Bolt On and Go” Description
The seller advertises the engine as complete and “bolt on and go.”
Before buying, request a written list of the components included in the package. Confirm whether it includes the controls, digital throttle and shift components, steering system, wiring harness, propeller, mounting hardware, and other rigging needed for your boat.
Installation compatibility depends on the vessel, steering arrangement, controls, shaft length, engine height, and gearcase. Confirm any additional parts, labor, or preparation that may be required.
Recommended Fuel and Operating Requirements
Mercury Racing specifies a minimum of 89-octane gasoline (R+M/2) for the published 450R engine configuration.
Follow the applicable Mercury Racing owner’s manual for approved fuel, oil, service intervals, storage, cooling-system maintenance, and operating procedures. Correct servicing and propeller selection are important for supporting engine performance and reliability.
Ideal Applications
The Mercury Racing 450R may suit compatible high-performance fishing boats, offshore performance vessels, performance center consoles, and other boats engineered for 450HP outboard propulsion.
Always verify the vessel manufacturer’s maximum horsepower rating, transom requirements, engine weight limits, steering system, shaft length, rotation, and gearcase compatibility before installation.
Shipping & Availability
Contact Norman Outboards to confirm current availability, exact engine model and serial number, 25-inch shaft configuration, RH rotation, gearcase type, engine hours, service records, included controls and rigging, and shipping costs.
Shipping, taxes, installation, and other services have not been specified and should be confirmed separately. Request a written invoice that identifies the engine and all components included in the sale.
The 2019 Mercury Racing 450R 450HP Outboard Motor is advertised with approximately 370 hours, a 25-inch shaft, right-hand rotation, and a very clean condition. Confirm the gearcase and complete-package contents before ordering.
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