2018+ 6.4L HEMI V8 Engine

The 2018+ 6.4L HEMI V8 is a high-performance naturally aspirated V8 from the Chrysler/Dodge performance engine family. Commonly associated with vehicles such as the Dodge Challenger R/T Scat Pack, Dodge Charger R/T Scat Pack and Jeep Grand Cherokee SRT, the 6.4L HEMI delivers the combination of strong V8 torque, classic HEMI character and modern engine technology.

At Prime Motor Ltd, the 6.4L HEMI V8 is an excellent powertrain option for customers undertaking engine swaps, muscle-car builds, restomods, performance projects, custom vehicles and restoration work.

6.4L HEMI V8 Overview

The 6.4L HEMI, also known as the 392 HEMI, has a displacement of approximately 6.4 liters / 392 cubic inches.

It uses Chrysler’s hemispherical-style combustion-chamber architecture and is designed to provide strong airflow, substantial torque and high-performance naturally aspirated power.

The engine is particularly popular among American muscle-car enthusiasts because of its combination of displacement, sound, torque and aftermarket support.

Key Features

• 6.4L / 392 cu. in. V8
• HEMI architecture
• Naturally aspirated
• Aluminum cylinder heads
• Variable valve timing
• Multi-Displacement System on applicable applications
• Electronic fuel injection
• High-flow performance cylinder heads
• Strong low- and mid-range torque
• Modern electronic engine management
• Extensive aftermarket support
• Suitable for performance engine-swap projects

Performance

The 6.4L HEMI is designed around naturally aspirated performance rather than turbocharging or supercharging.

In applications such as the Dodge Challenger and Charger Scat Pack, the engine has been factory-rated at approximately 485 horsepower and 475 lb-ft of torque, although exact output can vary by application, model year and calibration.

The 6.4L displacement provides strong torque without requiring forced induction, making it particularly effective for street-performance and muscle-car applications.

The 392 HEMI

The name 392 HEMI comes from the engine’s approximately 392 cubic-inch displacement.

This designation has become closely associated with Chrysler’s modern 6.4L performance V8.

The 392 HEMI has become a popular choice among enthusiasts looking for a larger-displacement naturally aspirated V8 than the 5.7L HEMI.

Variable Valve Timing

Applicable 6.4L HEMI configurations use variable camshaft timing to optimize engine operation across different speeds and loads.

This technology can help balance:

• Power
• Torque
• Fuel efficiency
• Emissions
• Drivability

Multi-Displacement System

Certain 6.4L HEMI applications feature Chrysler’s Multi-Displacement System (MDS).

Under suitable light-load operating conditions, the system can deactivate selected cylinders to reduce fuel consumption.

During heavier acceleration, the engine returns to full-cylinder operation.

The exact MDS configuration depends on the engine and vehicle application.

6.4L HEMI Applications

The 6.4L HEMI has been used across several Chrysler, Dodge, Jeep and Ram applications.

Common applications include:

• Dodge Challenger R/T Scat Pack
• Dodge Charger R/T Scat Pack
• Dodge Challenger SRT 392
• Dodge Charger SRT 392
• Jeep Grand Cherokee SRT
• Jeep Grand Cherokee Trackhawk-related platforms and performance applications
• Ram 2500 / 3500 applications
• Other Chrysler/Stellantis performance and heavy-duty applications

Important: Engine specifications differ between passenger-car, SUV and truck versions, so the exact engine application should always be confirmed before purchase.

Ideal Uses

The 2018+ 6.4L HEMI V8 is well suited to:

• Dodge muscle-car builds
• Chrysler performance projects
• Jeep performance builds
• Ram projects
• Engine swaps
• Restomods
• Classic American muscle cars
• Custom street cars
• Track projects
• Drag racing builds
• Performance restorations
• Custom automotive projects

Why Choose the 6.4L HEMI?

Large Displacement

At approximately 392 cubic inches, the 6.4L provides substantial naturally aspirated torque.

HEMI Architecture

The HEMI design has become one of the most recognizable performance-engine configurations in American automotive history.

Naturally Aspirated Performance

Unlike a turbocharged or supercharged engine, the standard 6.4L HEMI produces its factory performance without forced induction.

Strong Aftermarket Support

The 392 HEMI has a substantial performance aftermarket covering intake systems, exhaust, camshafts, cylinder heads, ECU tuning and forced-induction conversions.

Excellent Swap Platform

Its combination of displacement and performance makes the 6.4L HEMI attractive for custom engine-swap and restomod projects.

2018+ 6.4L HEMI Specifications

Specification	Details
Manufacturer	Chrysler / Dodge / Stellantis
Engine Family	HEMI
Common Name	392 HEMI
Displacement	6.4L / 392 cu. in.
Configuration	V8
Aspiration	Naturally Aspirated
Valvetrain	OHV / Pushrod
Fuel System	Electronic Fuel Injection
Variable Valve Timing	Yes, applicable configurations
MDS	Available on applicable configurations
Cylinder Heads	Aluminum
Engine Block	Cast Iron on many applications
Typical Scat Pack Output	Approximately 485 HP / 475 LB-FT
Applications	Dodge, Chrysler, Jeep and Ram

Important: Passenger-Car vs Truck 6.4L HEMI

Not every 6.4L HEMI is identical.

This is particularly important when purchasing an engine for a swap.

A 6.4L HEMI from a Dodge Challenger or Charger can have different components and calibration from a 6.4L HEMI used in a Ram heavy-duty truck or Jeep application.

Differences may include:

• Intake manifold
• Camshaft
• Cylinder heads
• Oil pan
• Accessories
• ECU
• Wiring
• Calibration
• Fuel system
• MDS configuration
• Exhaust
• Mounting configuration

Therefore, the exact engine code and donor vehicle should be confirmed before purchase.

Engine Swap Considerations

Installing a 6.4L HEMI into another vehicle can require additional components and modifications.

Depending on the project, you may need:

• Engine mounts
• Wiring harness
• ECU/PCM
• Immobilizer integration
• Transmission
• Transmission controller
• Fuel system
• Radiator
• Cooling system
• Exhaust system
• Headers
• Driveshaft
• Differential
• Throttle-control system
• Instrumentation

Transmission compatibility is particularly important when planning a complete powertrain swap.

Performance Upgrades

The 6.4L HEMI has significant aftermarket potential.

Common upgrades include:

• Cold-air intake
• Performance intake manifold
• Headers
• High-flow exhaust
• ECU tuning
• Camshaft upgrades
• Cylinder-head upgrades
• Performance valvetrain components
• Fuel-system upgrades
• Supercharger systems
• Turbocharger systems

As power increases beyond the factory configuration, the supporting fuel, cooling, drivetrain and internal-engine components should be matched appropriately.

Prime Motor Ltd

At Prime Motor Ltd, we supply performance-focused automotive products and powertrain solutions for enthusiasts, professional builders and custom automotive projects.

The 2018+ 6.4L HEMI V8 / 392 HEMI provides a powerful foundation for customers looking to build a Dodge, Chrysler, Jeep or custom performance vehicle.

Whether you’re working on a muscle-car restoration, restomod, engine swap, street-performance vehicle, track project or custom build, the 6.4L HEMI offers the displacement and V8 character expected from a modern American performance engine.

Explore Prime Motor Ltd: primemotorltd.com

Product Compatibility Notice

6.4L HEMI specifications can vary according to model year, donor vehicle, engine code and application. Passenger-car, SUV and truck versions may use different components, calibrations and accessories.

Before purchasing, customers should confirm the exact engine version, engine code, mileage/condition, included accessories, ECU/wiring requirements and transmission compatibility for their intended application.

Prime Motor Ltd — Performance Engines & Automotive Solutions.