Used 6.4 HEMI (392) Engine for Sale - Scat Pack, Ram 2500 & 3500

1. Quick Answer: What Should You Know Before Buying a Used 6.4 HEMI?

A used 6.4 HEMI can replace a failed engine in select Dodge Scat Pack, SRT 392, Ram 2500, and Ram 3500 applications, but the term "6.4 HEMI" covers multiple vehicle-specific configurations.

The most important fitment checks are:

1. VIN
2. Model year
3. Vehicle model
4. Engine code
5. 8th VIN digit where applicable
6. RWD or 4WD
7. Engine generation
8. MDS configuration
9. Transmission
10. Oil pan
11. Intake manifold
12. Accessory drive
13. Engine mounts
14. Exhaust manifolds
15. Wiring and sensors
16. Emissions configuration
17. Original engine part number when available
18. Whether the listing is a long block or complete assembly

A 6.4L HEMI from a Dodge Charger or Challenger Scat Pack can have different mounting, intake, oil pan, accessory, exhaust, electronics, and calibration requirements from a Ram 2500 or 3500 engine.

Request VIN-matched quotes from verified independent sellers and compare the seller's application details before ordering.

2. Key Takeaways

• Displacement size: The 6.4L HEMI is a 392-cubic-inch V8.
• Performance naming: Dodge commonly uses "392 HEMI" for performance applications of the 6.4L HEMI.
• Scat Pack profile: Charger and Challenger Scat Pack applications use a performance-oriented 6.4L HEMI configuration.
• Heavy-duty profile: Ram 2500 and 3500 use truck-specific 6.4L HEMI configurations.
• Cross-application limits: A Scat Pack 6.4L HEMI is not automatically a direct replacement for a Ram 2500 or 3500 6.4L HEMI.
• Component differences: Engine codes, VIN application, mounts, oil pan, intake, accessory drive, exhaust, wiring, and calibration can differ.
• Cylinder deactivation: MDS is an important fitment consideration on applicable 6.4L HEMI configurations.
• Donor context: Donor mileage provides useful context but does not by itself establish engine condition.
• Inspection & warranty: Inspection and testing practices vary by seller, while warranty terms vary by seller and part.
• Transparent quotes: Shipping costs are included in the seller's quote unless otherwise stated.
• Market choice: UAPP prioritizes used OEM parts, while some listings may be aftermarket or remanufactured. Transparent listing information lets buyers compare replacement choices.
• Pricing factors: Final pricing depends on seller availability, part condition, mileage, location, shipping requirements, and market demand.

3. What Is a 6.4 HEMI 392 Engine?

The 6.4L HEMI is a 392-cubic-inch V8 used in both Dodge performance vehicles and Ram Heavy Duty trucks. The "392" name comes from the engine's approximate 392-cubic-inch displacement.

The engine family can include application-specific differences in:

• Cylinder heads and Camshaft
• Intake manifold and Exhaust manifolds
• Oil pan and Accessory drive
• Engine mounts and Fuel system
• Engine control calibration, Wiring, and Sensors
• Emissions equipment

That is why the 392 designation alone should not be treated as a universal interchange identifier.

4. 6.4 HEMI in Dodge Scat Pack Applications

Dodge Charger Scat Pack

The Charger Scat Pack uses the 392 HEMI V8 in its traditional gasoline performance configuration. Dodge's published Charger specifications identify the 392 HEMI V8 at 485 horsepower and 475 lb-ft of torque, with MDS Fuel Saver technology on the referenced model years.

Exact fitment varies by: Model year, Charger generation, Scat Pack configuration, RWD, transmission, engine code, MDS, intake, exhaust, accessory drive, and emissions configuration.

Dodge Challenger R/T Scat Pack

The Challenger R/T Scat Pack used the 392-cubic-inch 6.4L HEMI V8. Dodge documentation for the Challenger identifies the 392 HEMI at 485 horsepower and 475 lb-ft of torque in applicable Scat Pack configurations. Confirm model year, R/T Scat Pack, RWD, transmission, engine code, MDS, intake, oil pan, accessory drive, and wiring.

SRT 392

Earlier Dodge Challenger and Charger SRT 392 models also used the 6.4L HEMI V8. The SRT 392 and Scat Pack names describe vehicle and performance configurations, not a universal engine interchange code. Always match the exact application.

5. 6.4 HEMI in Ram 2500 and Ram 3500

Ram 2500

Ram has used the 6.4L HEMI V8 as a gasoline engine option in Ram 2500 Heavy Duty trucks. Official Ram documentation shows the 6.4L HEMI in Ram 2500 applications, including older configurations paired with the 66RFE six-speed automatic and later configurations using updated powertrain hardware. Ram's current 2026 2500 specifications list the 6.4L HEMI V8 at 405 horsepower and 429 lb-ft of torque.

Ram 2500 fitment can vary by: Model year, 4x2 or 4x4, transmission, cab configuration, engine code, emissions configuration, accessory drive, cooling system, oil pan, intake, and engine mounts. Do not use a Scat Pack engine as a Ram 2500 replacement without confirming the complete application.

Ram 3500

The 6.4L HEMI has also been used in Ram 3500 applications. Ram's published Heavy Duty specifications identify 6.4L HEMI configurations for 3500 trucks, with output and equipment varying by model year. A Ram 2018 HD brochure, for example, lists 410 horsepower and 429 lb-ft of torque for the 6.4L HEMI V8. Ram 3500 fitment depends on model year, 4x2 or 4x4, single rear wheel or dual rear wheel, transmission, engine code, emissions configuration, accessory drive, cooling system, oil pan, intake, and engine mounts.

6. Scat Pack 6.4 HEMI Versus Ram 6.4 HEMI

7. 6.4 HEMI Engine Codes and VIN Fitment

Engine codes can be valuable when identifying a replacement. Depending on model year and application, buyers may encounter different 6.4L HEMI engine codes. Do not treat one engine code as universal across all Ram and Dodge applications. Confirm full VIN, engine code, model year, vehicle model, drivetrain, transmission, original engine part number, MDS configuration, and required component transfers.

The 8th VIN Digit

The 8th VIN position can identify engine configuration on many Chrysler, Dodge, and Ram vehicles. The exact meaning depends on the VIN structure and model year. Provide the full VIN to the seller rather than relying only on a single VIN position.

8. What Does a Used 6.4 HEMI Engine Include?

A used engine listing may describe the engine as a short block, long block, or complete assembly.

• Short Block: Commonly includes the engine block, crankshaft, pistons, and connecting rods. Exact contents vary by seller.
• Long Block: Generally adds major top-end components such as cylinder heads, valvetrain, and camshaft. Exact contents vary by seller.
• Complete Engine: Can include additional components such as intake manifold, throttle body, fuel system, ignition coils, exhaust manifolds, alternator, A/C compressor, water pump, accessory drive, oil pan, sensors, and wiring. Do not assume these components are included. Request a written component list from the seller.

9. Used 6.4 HEMI Engine Pricing

Used 6.4 HEMI prices vary widely by vehicle application, engine generation, engine code, donor mileage, long block versus complete assembly, condition, testing documentation, warranty terms, seller location, shipping requirements, and market demand.

Recent independent marketplace listings show a wide spread for used 392 Scat Pack engines, with examples around $5,400 to $8,500 depending on year, mileage, completeness, and seller. Some listings also show additional delivery charges. These are observed asking prices, not UAPP quotes.

Ram 6.4L HEMI engines can have a different market value because truck applications, model years, configurations, and completeness vary.

All prices are estimates. Final pricing depends on seller availability, part condition, mileage, location, shipping requirements, and market demand.

10. Used OEM Versus Remanufactured Versus Aftermarket 6.4 HEMI

11. Common 6.4 HEMI Problems and Inspection Areas

A used engine should be evaluated based on its actual condition rather than the 392 or HEMI name alone. Potential inspection areas include oil leaks, coolant leaks, cracked components, damaged threads, broken mounting points, corrosion, damaged wiring, damaged sensors, intake/exhaust manifold damage, oil pan damage, front cover damage, and accessory drive damage.

Valvetrain and MDS Considerations

Some 6.4L HEMI applications use cylinder-deactivation technology. Ask the seller whether the specific engine includes the same MDS configuration as the vehicle receiving it. Do not assume a non-MDS engine is a direct substitute for an MDS-equipped vehicle.

Oil Leaks & Cooling Systems

Inspect for oil residue around valve covers, front cover, oil pan, rear main seal area, oil filter housing or adapter where applicable, and timing components. An oil leak does not automatically mean the engine requires replacement. Furthermore, if the original engine failed from overheating, inspect the radiator, water pump, thermostat, hoses, cooling fans, coolant passages, and oil cooler components. Installing another engine without correcting the original cause can lead to another failure.

12. Inspection and Quality Considerations

Inspection and testing practices vary by seller and part category. Before ordering, ask for donor vehicle year, model, mileage, engine code, VIN application, compression info, oil pressure, leak inspection notes, running video when available, diagnostic info, photos of the actual engine, condition notes, and warranty terms.

What to Inspect in Photos: Look at the engine block, cylinder heads, valve covers, intake, exhaust manifolds, oil pan, front cover, engine mounts, accessory brackets, wiring connectors, sensors, throttle body, crank pulley, and any damage from collision or removal. Actual photos of the donor engine are more useful than generic engine images.

13. Warranty Considerations

Many sellers offer warranty coverage on select engines. Warranty terms, duration, exclusions, return procedures, and labor coverage vary by seller and part. Confirm all terms in writing before purchase.

Ask:

• What is the warranty period and is it for the complete engine or long block only?
• Are seals and gaskets covered? Is labor covered?
• Is diagnosis required before a claim? Does the seller require professional installation?
• What happens if an internal failure occurs, and who pays return freight?
• Are overheating, contamination, or installation-related failures excluded?

14. Shipping and Delivery

Engines are heavy freight items, so shipping requirements vary by seller, carrier, destination, and packaging method. Shipping costs are included in the seller's quote unless otherwise stated. Delivery timelines vary by seller location, part type, carrier availability, freight requirements, and destination.

Before ordering, confirm: Shipping cost, freight carrier, commercial versus residential delivery, liftgate requirements, delivery appointment, packaging, estimated delivery time, damage inspection procedure, freight damage claim process, and return freight terms. Inspect the engine crate or pallet and the engine itself for visible shipping damage before accepting delivery when carrier procedures allow.

15. Buying Guide: How to Choose a Used 6.4 HEMI Engine

1. Identify the Vehicle: Record year, make, model, trim, VIN, engine code, and 2WD, 4WD, or AWD configuration.
2. Identify the Original Engine: Record engine code, VIN, original part number, MDS configuration, oil pan, intake, accessory drive, and engine mounts.
3. Decide What Assembly You Need: Specify short block, long block, complete engine, engine with accessories, engine with intake, or engine with exhaust components.
4. Request Donor Information: Ask for donor year, model, mileage, engine code, running condition if known, inspection documentation, and actual photos.
5. Confirm Compatibility: Have the seller confirm VIN application, engine code, model year, drivetrain, transmission, MDS, and required component transfers.
6. Compare Quotes: Compare price, mileage, completeness, condition, testing information, warranty, return terms, and shipping costs.

16. Used 6.4 HEMI Engine Buying Checklist

Vehicle: VIN provided, model year confirmed, Charger/Challenger/Ram 2500/Ram 3500 confirmed, engine code confirmed, drivetrain confirmed, transmission confirmed, trim confirmed.

Engine: 6.4L displacement confirmed, 392 designation confirmed where applicable, MDS configuration confirmed, oil pan confirmed, intake confirmed, accessory drive confirmed, mounting points confirmed, engine code confirmed, included components confirmed.

Seller: Donor mileage requested, actual photos reviewed, condition notes reviewed, testing documentation requested, warranty terms reviewed, return terms reviewed, shipping costs confirmed, freight requirements confirmed.

17. Charger, Challenger, and Ram Fitment Guides

• Charger Scat Pack: Confirm model year, Scat Pack trim, RWD, transmission, engine code, MDS, intake, oil pan, accessory drive, wiring, and exhaust configuration.
• Challenger R/T Scat Pack: Confirm model year, R/T Scat Pack, RWD, transmission, engine code, MDS, intake, oil pan, accessory drive, and wiring.
• Ram 2500 6.4 HEMI: Confirm model year, 4x2 or 4x4, engine code, transmission, oil pan, intake, accessory drive, cooling system, engine mounts, wiring, and emissions configuration.
• Ram 3500 6.4 HEMI: Confirm model year, 4x2 or 4x4, single rear wheel or dual rear wheel, engine code, transmission, oil pan, intake, accessory drive, cooling system, mounts, wiring, and emissions configuration.

18. Complete Engine Versus Long Block

19. Common Reasons to Buy a Used 6.4 HEMI Engine

• Engine Failure: A used engine can be considered when the original engine has suffered major internal damage.
• Collision Repair: A donor vehicle can provide a replacement engine when the vehicle body is damaged but the engine remains usable.
• Cost-Conscious Replacement: A used OEM engine can cost less than a new OEM assembly, depending on application.
• Performance Vehicle Repair: Owners of Charger and Challenger Scat Pack vehicles may seek a replacement 392 engine that matches the original performance-car configuration.
• Heavy-Duty Truck Repair: Ram 2500 and 3500 owners may seek a used 6.4L HEMI when the original gasoline engine requires replacement.

20. Signs a Used 6.4 HEMI Listing Needs Extra Attention

Ask additional questions if the listing shows:

• No engine code, no VIN application, or no donor mileage
• No actual photos, no condition information, or stock photos only
• Unknown oil pan, unknown intake, or unknown accessory drive
• Damaged mounts, heavy corrosion, broken connectors, or missing sensors
• Unknown MDS status, unclear completeness, or unclear model-year compatibility

A low asking price can become more expensive if major components must be transferred or purchased separately.

21. How to Compare Two Used 6.4 HEMI Engine Quotes

22. Installation Considerations

Replacing a 6.4L HEMI can involve substantial labor. Depending on the vehicle, installation can include engine removal, transmission separation, exhaust disconnection, cooling-system disconnection, fuel-system disconnection, electrical harness removal, accessory transfer, intake transfer, exhaust manifold transfer, oil pan transfer, engine mount transfer, sensor transfer, module procedures, fluid replacement, cooling-system bleeding, diagnostic scanning, and road testing.

Components Commonly Considered for Transfer

Depending on compatibility, an installer may evaluate the intake manifold, throttle body, fuel rails, injectors, ignition coils, alternator, A/C compressor, water pump, front accessory drive, exhaust manifolds, engine mounts, oil pan, wiring, and sensors. Do not transfer components automatically. Verify compatibility and condition first.

23. Post-Installation Checks and Service

After installation, verify oil level, coolant level, fuel-system operation, charging system, belt alignment, cooling fans, diagnostic codes, oil pressure where appropriate, engine temperature, transmission operation, leaks, and warning lights. Follow the vehicle manufacturer's service procedures and use qualified technicians when required.

Warranty Documentation to Keep: Keep copies of the seller quote, invoice, warranty terms, VIN fitment confirmation, engine code, donor mileage, installation invoice, initial diagnostic report, fluid receipts, and required installation documentation. These documents can be important if a warranty issue develops.

24. Frequently Asked Questions

1. Is the 6.4 HEMI the same as the 392 HEMI?

The 392 designation refers to the approximate cubic-inch displacement of the 6.4L HEMI. Dodge commonly uses "392 HEMI" for performance applications, but the engine family also appears in Ram Heavy Duty applications with different vehicle-specific configurations.

2. What vehicles use the 6.4 HEMI?

The 6.4L HEMI has been used in Dodge performance vehicles such as the Charger and Challenger, as well as Ram Heavy Duty trucks including the 2500 and 3500. Other Chrysler-family vehicles have also used 6.4L HEMI configurations.

3. Is a Scat Pack 6.4 HEMI the same as a Ram 6.4 HEMI?

No. The engines share the 6.4L displacement and HEMI architecture, but vehicle-specific components and calibrations can differ.

4. Can a Ram 2500 6.4 HEMI fit a Challenger Scat Pack?

Not automatically. Confirm engine code, VIN application, mounts, oil pan, intake, accessory drive, wiring, exhaust, calibration, and other required components.

5. Can a Scat Pack 6.4 HEMI fit a Ram 2500?

Not automatically. A Scat Pack engine is a performance-car application, while the Ram 2500 uses a Heavy Duty truck configuration. Confirm exact application before ordering.

6. Does the 6.4 HEMI use MDS?

Some 6.4L HEMI applications use cylinder-deactivation technology, while exact configurations vary by vehicle and model year. Confirm the MDS configuration of the replacement and the vehicle.

7. How much horsepower does a 392 HEMI make?

Output depends on the vehicle and model year. Dodge documentation lists 485 horsepower for referenced Charger and Challenger Scat Pack 392 applications. Ram Heavy Duty 6.4L HEMI engines use different truck-specific output ratings.

8. How much does a used 6.4 HEMI engine cost?

Prices vary substantially by application, year, mileage, completeness, condition, seller, warranty, and shipping. Recent observed Scat Pack listings were around $5,400 to $8,500, but these are market asking prices rather than UAPP quotes.

9. What does a used 6.4 HEMI engine include?

It depends on the seller. A listing may be a short block, long block, or more complete engine assembly. Confirm the included components in writing.

10. Does the engine include the intake manifold?

Not necessarily. Confirm whether the intake, throttle body, fuel system, and related components are included.

11. Does the engine include the oil pan?

Not necessarily. Oil pans can differ between vehicle applications, especially between passenger cars and Heavy Duty trucks.

12. Does a used 6.4 HEMI come with a warranty?

Many sellers offer warranty coverage on select engines. Warranty terms, duration, exclusions, return procedures, and labor coverage vary by seller and part.

13. Does shipping cost extra?

Shipping costs are included in the seller's quote unless otherwise stated. Delivery timelines vary by seller location, part type, carrier availability, freight requirements, and destination.

14. How important is donor mileage?

Donor mileage provides useful context but does not establish engine condition by itself. Ask about the donor vehicle, reason for dismantling, operating history when available, and inspection documentation.

15. Can I use a long block from another 6.4 HEMI?

Potentially, depending on the exact application. A long block may allow transfer of vehicle-specific external components, but compatibility must be confirmed before purchase.

16. What is the difference between a 6.4 HEMI and a 392?

They refer to the same basic displacement. "392" is the approximate cubic-inch designation, while 6.4L is the metric displacement. Vehicle-specific configurations can still differ.

17. Does UAPP sell 6.4 HEMI engines directly?

No. Used Auto Parts Pro is a marketplace that connects buyers with verified independent sellers. Sellers list their own parts, set their own prices, define warranty terms, and ship directly to buyers or repair shops.

18. Does UAPP test every used 6.4 HEMI engine?

No. UAPP does not directly test parts. Inspection and testing practices vary by seller and part category. Buyers should request seller-specific condition and test information.

19. Can a 6.4 HEMI replace a 5.7 HEMI?

Not as a simple replacement. A 6.4L engine has different displacement, components, calibration, and application requirements. Engine swaps require substantial compatibility review and may require additional hardware and control-system changes.

20. What is the safest way to order a used 6.4 HEMI?

Provide the complete VIN and original engine information, confirm the engine code and vehicle application, request actual photos and donor mileage, verify what components are included, review warranty and return terms, and confirm shipping requirements before ordering.

25. Conclusion

A used 6.4L HEMI engine can be a practical, OEM-based replacement option for Ram Heavy Duty pickups, Dodge Charger, and Dodge Challenger Scat Pack/SRT 392 vehicles when the correct engine configuration is matched to the vehicle.

The most important factors are VIN compatibility, model year, engine code, drivetrain, MDS configuration, engine completeness, oil pan and intake compatibility, warranty terms, and shipping costs.

Because Dodge and Ram change 6.4L HEMI components across model years and vehicle types—such as performance car versus Heavy Duty truck differences—always verify the exact vehicle details, engine code, and part number before ordering.

Used Auto Parts Pro provides a marketplace for comparing used OEM auto parts from verified independent sellers. Buyers can request VIN-matched quotes and compare seller-specific price, condition, warranty, and shipping information before making a purchase.