Jeep SRT 6.4 Hemi Engine For Sale: Your Ultimate Guide to Power and Performance

Jeep SRT 6.4 Hemi Engine For Sale: Your Ultimate Guide to Power and Performance jeeps.truckstrend.com

Introduction: Unleashing the Beast – The 6.4L Hemi SRT Engine

For automotive enthusiasts, performance junkies, and those seeking to inject serious power into their ride, the phrase "Jeep SRT 6.4 Hemi Engine For Sale" often sparks immediate interest. This isn’t just any engine; it’s the heart of the formidable Jeep Grand Cherokee SRT, a vehicle renowned for blending SUV practicality with sports car-rivalling acceleration. The 6.4-liter (392 cubic inch) Hemi V8 is a modern marvel of engineering, delivering an intoxicating blend of raw power, distinctive sound, and surprising reliability, making it a highly sought-after commodity in the aftermarket.

Jeep SRT 6.4 Hemi Engine For Sale: Your Ultimate Guide to Power and Performance

Whether you’re looking to replace a worn-out engine in your existing Grand Cherokee SRT, undertaking an ambitious Hemi swap into an older Jeep or a custom build, or simply seeking an unparalleled performance upgrade, finding a high-quality Jeep SRT 6.4 Hemi Engine For Sale is your first crucial step. This comprehensive guide will delve into everything you need to know about this legendary powerplant, from its technical prowess to where and how to acquire one, ensuring you make an informed and successful purchase.

The Powerhouse Within: Understanding the 6.4L Hemi SRT Engine

The 6.4L Hemi, often referred to as the "392 Hemi," is a direct descendant of a long line of iconic Chrysler V8s. Introduced in 2011, it built upon the success of the earlier 6.1L Hemi, significantly boosting displacement and performance. It became the standard engine for the Jeep Grand Cherokee SRT (WK2 generation from 2012-2021), as well as various Dodge Challenger and Charger SRT 392 models.

Key Specifications and Technological Highlights:

• Displacement: 6.4 liters (392 cubic inches)
• Horsepower (Stock): Typically ranges from 470 to 475 hp, depending on the specific vehicle and year.
• Torque (Stock): Approximately 465 lb-ft.



• Compression Ratio: 10.9:1
• Fuel Requirement: Premium unleaded (91+ octane) is recommended for optimal performance.
• Key Technologies:
  • Variable Valve Timing (VVT): Optimizes valve lift and duration for improved power and fuel efficiency across the RPM range.

  

  • Multi-Displacement System (MDS): Allows the engine to seamlessly switch from 8-cylinder to 4-cylinder mode under light load conditions to conserve fuel. (Note: Many tuners disable MDS for performance applications).
  • Active Intake Manifold: Optimizes airflow for different engine speeds, improving both low-end torque and high-end horsepower.
  • Robust Bottom End: Features a forged steel crankshaft and powdered metal connecting rods, designed to handle significant power.

The 6.4L Hemi SRT engine is celebrated not just for its peak numbers but also for its broad torque curve, making it incredibly responsive and exhilarating in a wide range of driving conditions. Its distinctive roar is instantly recognizable, adding to its appeal.

Why Buy a Used 6.4L Hemi SRT Engine? Applications and Benefits

The decision to seek out a Jeep SRT 6.4 Hemi Engine For Sale typically stems from one of several compelling reasons, each offering unique benefits:

1. Performance Upgrade for Older Jeeps: One of the most popular applications is swapping this engine into earlier generation Grand Cherokees (like the WK1 SRT8, replacing the 6.1L) or even into Jeep Wranglers (JK/JL platforms). The significant power bump transforms these vehicles into true beasts.
2. Engine Replacement: For owners of a Grand Cherokee SRT whose original 6.4L Hemi has suffered catastrophic failure, acquiring a replacement engine is often more cost-effective than buying a new vehicle.
3. Custom Builds and Restomods: The 6.4L Hemi is a prime candidate for "resto-mod" projects, breathing modern performance into classic muscle cars, trucks, or even unique off-road vehicles. Its relatively compact size for its displacement makes it versatile.
4. Cost-Effectiveness: Purchasing a used 6.4L Hemi can be significantly cheaper than buying a brand-new crate engine from Mopar, which can easily run into five figures. This makes high-performance accessible to a wider audience.
5. Availability: While specific configurations can be rare, the overall availability of used 6.4L Hemi engines from salvage vehicles or performance shops is generally good, especially compared to some niche or discontinued performance engines.

Navigating the Market: Where to Find a Jeep SRT 6.4 Hemi Engine For Sale

Finding the right Jeep SRT 6.4 Hemi Engine For Sale requires knowing where to look and exercising due diligence. Here are the primary avenues:

• Online Marketplaces & Forums:
  • eBay Motors: A vast selection, but requires careful vetting of sellers. Look for high-resolution photos, detailed descriptions, and seller ratings.
  • Facebook Marketplace/Groups: Many dedicated Hemi swap or SRT owner groups are excellent places to find engines for sale by individuals or small shops.
  • Dedicated Automotive Forums: Websites like LXForums, SRT forums, or specific Jeep enthusiast forums often have "for sale" sections where members list engines.
• Specialized Salvage Yards & Recyclers:
  • LKQ (and similar large salvage networks): These companies specialize in parting out wrecked vehicles and often have a good inventory of low-mileage engines. They typically test engines before selling.
  • Local Performance Salvage Yards: Some smaller, specialized yards focus on performance vehicles and may have high-quality units.
• Engine Builders & Suppliers:
  • Remanufactured Engine Suppliers: Companies that rebuild engines to factory or better-than-factory specifications. These often come with a warranty but are pricier.
  • Performance Shops: Many shops that specialize in Hemi swaps or performance builds will source and sell engines, sometimes offering turn-key packages.
• Networking: Word-of-mouth among car clubs, at car shows, or through local mechanics can sometimes lead to hidden gems.

What to Look For: Essential Considerations When Buying a Jeep SRT 6.4 Hemi Engine For Sale

Purchasing a used engine, especially a high-performance one, carries inherent risks. Mitigate these risks by meticulously inspecting and vetting any potential Jeep SRT 6.4 Hemi Engine For Sale:

1. Seller Reputation:
   • Online Reviews: Check independent reviews for online sellers or salvage yards.
   • Forum Feedback: Ask for recommendations or search for seller names on forums.
   • Communication: A reputable seller will be transparent, responsive, and willing to provide detailed information.
2. Engine Condition & History:
   • Mileage: Lower mileage is generally preferred, but don’t solely rely on it. An engine with higher mileage that was meticulously maintained can be better than a low-mileage abused one.
   • Donor Vehicle Information: Ask about the donor vehicle – what was it (Grand Cherokee SRT, Challenger, Charger), what year, and why was it salvaged (front-end collision, rear-end, rollover)? This helps determine potential internal damage or stress.
   • Visual Inspection:
     • Leaks: Look for oil, coolant, or fuel leaks around seals, gaskets, and hoses.
     • Damage: Inspect for cracks in the block or heads, broken mounts, or damaged accessory points.
     • Cleanliness: A very clean engine might suggest recent power washing, potentially hiding leaks. A moderate amount of dust/grime is normal.
     • Oil Color: If possible, check the oil on the dipstick. It should not be milky (indicating coolant) or excessively sludgy.
   • Testing (If Possible):
     • Compression Test: The absolute best indicator of internal health. Ask for results or if they can perform one.
     • Leak-Down Test: Even better than compression, but rarely done on salvage engines.
     • Video of Engine Running: If the engine is still in the donor vehicle, ask for a video of it starting cold and running smoothly.
3. Completeness of the Package:
   • Long Block: Typically includes the block, heads, valvetrain, crankshaft, pistons, and rods. You’ll need to source all accessories.
   • Complete Drop-Out (or "Cut Out"): This is often the most desirable for swaps as it includes the engine, transmission, engine wiring harness, ECU (Engine Control Unit), and all accessories (alternator, power steering pump, AC compressor, intake manifold, exhaust manifolds, etc.). This significantly simplifies the swap process, though it’s more expensive.
   • Accessories: Ensure all critical sensors, injectors, coil packs, and the throttle body are included and undamaged.
4. Documentation & Warranty:
   • Donor Vehicle Title/VIN: This helps verify the engine’s origin and mileage (though odometer readings on salvaged vehicles can be tricky).
   • Warranty: Most used engines are sold "as-is." However, reputable salvage yards or remanufacturers may offer a limited warranty (e.g., 30-90 days). Understand its terms fully.
5. Shipping & Logistics:
   • Cost: Freight shipping for an engine can be expensive. Get a clear quote.
   • Insurance: Ensure the shipment is insured against damage during transit.
   • Crater/Packaging: The engine should be properly drained of fluids and securely crated on a pallet.

The Swap Process: What You Need to Know

Acquiring a Jeep SRT 6.4 Hemi Engine For Sale is only the first step. Installing it, especially into a vehicle it didn’t originally come in, is a complex undertaking that requires significant planning and additional components:

• Transmission Compatibility: The 6.4L Hemi typically pairs with robust automatic transmissions like the 545RFE, 65RFE, 8HP70 (8-speed automatic), or manual transmissions like the Tremec TR-6060. Ensure your chosen transmission can handle the Hemi’s power and is compatible with the engine and your vehicle.
• Wiring Harness & ECU: This is often the most challenging aspect. You’ll need a standalone wiring harness and a properly tuned ECU. Aftermarket companies specialize in providing these for Hemi swaps.
• Engine Mounts: Custom engine mounts are almost always required for swaps.
• Cooling System: The Hemi generates significant heat. An upgraded radiator, fan, and potentially an oil cooler are essential.
• Fuel System: The 6.4L Hemi requires a robust fuel pump and lines to deliver adequate fuel pressure and volume.
• Exhaust System: Custom exhaust fabrication will be necessary.
• Driveshafts & Drivetrain: Ensure your existing drivetrain components (driveshafts, axles, differentials) can handle the increased power.
• Professional Installation vs. DIY: Unless you have extensive mechanical and electrical experience, a Hemi swap is best left to a professional performance shop.

Potential Challenges and Solutions

• Challenge: Finding a Reputable Seller.
  • Solution: Stick to well-reviewed businesses, ask for references, and verify information. If a deal seems too good to be true, it probably is.
• Challenge: Verifying Engine Health Remotely.
  • Solution: Request detailed photos, videos of the engine running (if possible), and ask specific questions about compression tests or maintenance history. Consider a third-party inspection if the seller is local to an inspector.
• Challenge: Shipping Damage.
  • Solution: Always ensure the shipment is fully insured. Document the condition of the crate upon arrival with photos before unpacking.
• Challenge: Compatibility Issues During Swap.
  • Solution: Thoroughly research your specific swap project before purchasing the engine. Consult forums, specialized shops, and Hemi swap guides. Buy a complete drop-out package if your budget allows, as it reduces compatibility headaches.
• Challenge: Unexpected Costs During Installation.
  • Solution: Budget generously! Always set aside extra funds for unforeseen issues, custom fabrication, and professional tuning. The engine cost is often only 30-50% of the total swap cost.

Price Table: Jeep SRT 6.4 Hemi Engine For Sale

Prices for a Jeep SRT 6.4 Hemi Engine For Sale can vary significantly based on condition, mileage, completeness, and the seller. This table provides estimated ranges.

Engine Type/Completeness	Condition/Mileage	Estimated Price Range (USD)	Notes
Long Block	High Mileage (80k+ miles)	$3,500 – $5,500	Bare engine (block, heads, internals). Requires all accessories.
	Low Mileage (30k-80k miles)	$5,500 – $8,000	Good candidate for refresh or direct swap.
Complete Drop-Out	High Mileage (80k+ miles)	$6,000 – $9,000	Includes engine, transmission, ECU, wiring, accessories. More involved inspection needed.
	Low Mileage (30k-80k miles)	$9,000 – $13,000	Ideal for swaps. Check transmission health carefully.
Remanufactured Engine	Zero Miles / Rebuilt	$10,000 – $16,000	Professionally rebuilt, often with warranty. Excludes transmission.
New Crate Engine (Mopar)	Brand New	$14,000 – $18,000+	Direct from manufacturer. May require additional parts for specific applications.

Note: These prices are estimates and can fluctuate based on market demand, location, seller, and specific included components. Shipping costs are typically extra and can add $300-$1000+.

Frequently Asked Questions (FAQ) about the Jeep SRT 6.4 Hemi Engine For Sale

Q1: What vehicles did the 6.4 Hemi engine originally come in?
A1: The 6.4L (392 cu in) Hemi engine was primarily used in the Jeep Grand Cherokee SRT (WK2 generation, 2012-2021), as well as Dodge Challenger SRT 392, Charger SRT 392, and some Ram 2500/3500 HD trucks.

Q2: Can I put a 6.4 Hemi in my older Jeep Wrangler or Grand Cherokee?
A2: Yes, the 6.4L Hemi is a popular engine for swaps into various Jeep models, including JK/JL Wranglers and WK1 Grand Cherokees. However, it requires significant modifications, including engine mounts, wiring harness, ECU tuning, transmission, cooling system, and fuel system upgrades. It is not a bolt-in process.

Q3: What’s the main difference between a 6.4 Hemi and a 6.1 Hemi?
A3: The 6.4L Hemi is a larger displacement engine than the 6.1L. It features variable valve timing (VVT), an active intake manifold, and often Multi-Displacement System (MDS), which the 6.1L does not have. The 6.4L produces significantly more horsepower and torque than the 6.1L.

Q4: Do I need a special transmission for the 6.4 Hemi?
A4: The 6.4L Hemi requires a robust transmission capable of handling its power and torque. Common factory pairings include the 545RFE, 65RFE, and 8HP70 (8-speed automatic). For swaps, you’ll need a compatible transmission and often a custom bellhousing or adapter plate.

Q5: How much horsepower does a stock 6.4 Hemi make?
A5: A stock 6.4L Hemi typically produces between 470 and 475 horsepower and around 465 lb-ft of torque, depending on the specific vehicle application and model year.

Q6: Is it worth buying a high-mileage 6.4 Hemi engine?
A6: It can be, especially if your budget is limited. However, a high-mileage engine should be purchased with the expectation that it may require internal inspection, new seals, or even a partial rebuild. Always try to get a compression test and thoroughly inspect it visually.

Q7: What’s the difference between a "long block" and a "drop-out" engine?
A7: A "long block" typically includes the engine block, cylinder heads, crankshaft, pistons, and camshaft, but no external accessories (alternator, intake manifold, exhaust manifolds, etc.). A "drop-out" or "cut-out" engine is a complete assembly that includes the engine, transmission, engine wiring harness, ECU, and all necessary accessories, making it much easier for a swap but also more expensive.

Conclusion: Powering Your Passion

The pursuit of a Jeep SRT 6.4 Hemi Engine For Sale is more than just a transaction; it’s an investment in exhilarating performance and a testament to your passion for automotive excellence. This 392 Hemi is a legendary powerplant, known for its formidable output and robust design, capable of transforming a mere vehicle into a true performance machine.

By understanding its technical specifications, knowing where to source a reliable unit, and meticulously inspecting its condition, you can confidently navigate the market. Remember that the engine’s cost is just one part of the equation; budgeting for the full swap, including supporting modifications and professional installation, is crucial for a successful project. With careful planning and due diligence, you can unleash the beast that is the 6.4L Hemi, ensuring years of thrilling, high-performance driving.