DODGE 6.4L SRT V8 HEMI ENGINE

Introduced in 2005 and widely available as early as 2007, DODGE 6.4L SRT V8 HEMI ENGINE “392” HEMI is a third‑generation (Gen III) HEMI V8 developed for performance variants like the Charger SRT8, Challenger SRT8 / 392, DODGE 6.4L SRT V8 HEMI ENGINE, Wrangler 392, and Ram HD platforms .

The engine, codenamed “Apache” and built at the FCA/Stellantis Saltillo Engine Plant in Mexico, became a signature of Mopar’s high‑performance line, offering 485 horsepower and 475 lb‑ft of torque in production form between roughly 2015 and present lithium‐2025 (with earlier output figures slightly lower) .

Stellantis has recently announced a return to V‑8 production, including the 6.4‑L Apache, at its Michigan Dundee Engine Plant starting August 2025, reviving interest in the iconic DODGE 6.4L SRT V8 HEMI ENGINE

 Technical Specs & Engineering Highlights

Here are the core specifications of the Mopar DODGE 6.4L SRT V8 HEMI ENGINE:

• Displacement: 392 cu. in. (6.4 liters)

• Horsepower: ~485 hp @ ~6,400 rpm

• Torque: ~475 lb‑ft

• Bore x Stroke: 103.9 mm × 94.6 mm

• Compression Ratio: 10.9:1

• Materials: Cast iron block with 4‑bolt powder‑metal bearing caps; forged steel crank; powdered‑metal rods; hypereutectic aluminum pistons; nodular iron camshaft; 319 aluminum cylinder heads with Hemi‑spherical combustion chambers; valves sizes ~54.3 mm intake / ~42 mm exhaust

Many crate engines come as “deluxe long block” packages—i.e. core engine internals including heads and timing cover, but without throttle body, intake manifold or accessories. Full crate engines with all accessories included (water pump, intake manifold, throttle body, injectors, coil packs, flywheel, clutch) are also sold under specific part numbers

Estimated Pricing (mid‑2025):

• Magnum Force (complete assembly): ~$8,500 USD includes complete engine with intake, fuel system, harness options

• shopHEMI / Mopar online listings: from ~$8,045 to $8,499 for the non‑MDS version of 6.4L crate engines, complete assembly with accessories

Higher retail MSRP & dealer pricing:

• Mopar eStore listing shows MSRP ~$9,600 for part 68303090AC (complete engine), discounted to about $8,045 with free shipping and full warranty if purchased with installation kit on same invoice; current lead times estimated at 6–8 weeks

• SRT Performance WA had a posting at ~$22,000, likely including extensive accessories or installation—but typical full crate packages hover $8k–$9k

Secondary market:

• eBay “Authentic Mopar Performance 392 HEMI V8” listings show new at about $8,299.50 USD in Cincinnati, Ohio, with limited return policy

• Reddit user remarks mention new DODGE 6.4L SRT V8 HEMI ENGINE shipped for around $4k as a used engine, while crate engines commonly cited at $7–9k for new units

 Where to Buy & Availability DDODGE 6.4L SRT V8 HEMI ENGINE

Primary retail/official sources:

• MoparOnlinePerformance.com offers part numbers 68303090AA / 68303090AC — official factory Mopar crate engines (non‑MDS version) with nationwide 3‑year/100k‑mile warranty, direct shipping from depots across the U.S. Requires installation kit purchase on same invoice for full warranty

• Magnum Force sells complete assemblies (DIR68303090AA) including water pump, intake, fuel system… priced ~$8,500 with all internal components

• Speedway Motors offers “Deluxe long block” with or without manifold/throttle body; current $6,999.99 price for long‑block (no harness) but noted “discontinued” or limited stock favorites; full crate versions may cost more and require harness custom work

Specialist vendors:

• Kezar Performance / Speedway Motors sells the long‑block deluxe 392 performance Gen III Hemi, limited stock, ~485 hp, but does not include intake/throttle body—suitable for hot‑rod builds needing custom accessories

Used/secondary markets:

• Sites like eBay, LKQ, local salvage yards or engine rebuilders offer used or remanufactured 6.4L units—prices often around $4k to $6k depending on mileage and condition. Buyers should verify whether the engine is compatible and complete (e.g. electronics, control harness).

 Wiring, ECU & Installation Considerations

• Many crate engines (especially long‑block only versions) do not include a wiring harness or ECU; these are critical to run and integrate the engine into a vehicle

• Engines configured for modern models include MDS (Multiple Displacement System)—certain Mopar versions include it while others (e.g. part #68303090AA variant) explicitly delete MDS depending on buyer preference. Non‑MDS units avoid the complexity of cylinder deactivation

• Many Reddit users caution that engines intended for Jeep SRT replacements may not work as plug‑and‑play in classic Mopar platforms without a custom Direct‑Connection harness, which often takes ~12 weeks to deliver

• If purchasing a complete crate (Mopar kit), you must also purchase the engine controller kit (P/N 77072451AG or 77072454AI) and accessory drive kits to qualify for the Mopar 3‑yr/100k‑mile warranty

 Why Enthusiasts Choose the DODGE 6.4L SRT V8 HEMI ENGINE

• 595 lb‑ft torque & 485 hp yield exhilarating muscle‑car performance, yet the engine retains a relatively docile and street‑tame character compared to Hellcats

• The engine is robust—well over 600 hp with modest upgrades (boosted or stroked), per builder comments on forums

• Bolt‑in nature: in Dodge SRT models and some swap kits, it bolts right into LX platform vehicles (Magnum, Charger, Challenger), simplifying installation

• It represents one of the last great naturally aspirated V‑8s before muscle car lines turned to Hellcat supercharged engines and then to turbo I‑6s or EV drivetrains—hence collector and enthusiast appeal .

 Pros & Cons Summary

 Steps to Purchase & Prepare for Installation DODGE 6.4L SRT V8 HEMI ENGINE

1. Decide new vs used

   • New crate = ~$8k–9k USD, full warranty if installation kit included.

   • Used/reman = ~$4k–6k but may need rebuild or missing parts.

2. Decide configuration

   • Full crate vs long‑block only. Full crate includes intake, injectors, throttle body, etc. Long‑block more suited to custom swaps.

3. Ensure compatibility

   • If building a swap into a classic Mopar, confirm wiring harness, ECU, accessory kits match your car and transmission type. For Jeep SRT, some harnesses not available.

4. Purchase required installation accessories

   • Mopar harness kit (Part 77072451AG/54AI), accessory drive kit, filter adapters, exhaust manifolds if needed—all eligible with same invoice for warranty.

5. Shipping & handling

   • Engines weigh ~600 lb; require crate shipping via freight. Factor shipping ($~275) and brokerage/customs for international buyers.

6. Installation & tuning

   • Work with a trusted performance shop experienced in Mopar powertrain swaps. Accommodate fuel system upgrades, ECU tuning, emissions requirements.

 Where to Buy (Summary)

• Factory Mopar online dealers (e.g., MoparOnlinePerformance.com): genuine parts numbers 68303090AA/AC, full warranty, ~$8k after discount, ships from U.S. depots, 6‑8 week lead time Magnum Force (retail online) sells fully assembled units including harness options for ~$8,500 USD

• Speedway Motors / Kezar Performance long‑block: available for classic builds, price ~$6,999 for long‑block (no harness), limited stock

• shopHEMI.com / Arrington Engines offers DODGE 6.4L SRT V8 HEMI ENGINE long‑block for about $8,499, with upgrade options

• eBay / salvage / local engine rebuilders: used units ~US $4k–6k with no warranty; inspect carefully

 Final Thoughts

If you’re seeking a no‑compromise factory-grade muscle car engine with raw power and legendary Mopar durability, the DODGE 6.4L SRT V8 HEMI ENGINE remains a top-tier choice in mid‑2025. Available brand new for ~$8,000–$9,000 (with warranty options), or used from ~$4k if you’re willing to take more risk.

What makes it special today:

• End of an era: Final naturally aspirated Mopar V‑8 before electrification wave.

• Factory reliability: Forged internals and proven architecture.

• Swap versatility: Works well in classic Mopar builds, SRT platform cars, Jeeps with swap kits.

But be sure to:

• Understand exactly what’s included: long‑block vs fully dressed crate.

• Budget for harnesses, accessories, shipping and installation.

• Verify compatibility with your vehicle and regional legal requirements (especially emissions).

• Factor lead time: popular engines may take weeks to ship after ordering.

 Practical Buying Checklist DODGE 6.4L SRT V8 HEMI ENGINE

• [ ] Chosen vendor & engine configuration (full crate / long‑block)

• [ ] MDS vs non‑MDS engine version

• [ ] Required accessories: engine harness kit & installation accessories

• [ ] Shipping logistics & customs for your region

• [ ] Certified installer or tuning shop lined up

• [ ] Receipt/invoice together with installation kit for full Mopar warranty

Real‑World User Notes (from Reddit Builds)

• “I just caught an ad for a DODGE 6.4L SRT V8 HEMI ENGINE with all the electronics for $4 K shipped.” → suggests private/eBay deals on used engines; these seldom include warranty or harnesses

• “Crate 392’s are about $10 k” — typical pricing ballpark before discounts or regional promotion .

• “I’d go 392 all day! Bolts right in!” — users finding these engines easy swaps into LX‑platform cars (Charger, Challenger, Magnum)

Conclusion

The DODGE 6.4L SRT V8 HEMI ENGINE “Apache” HEMI—Mopar’s Gen III 392 crate engine—continues to be one of the most desirable performance engines on the market. With roughly 485 hp, 475 lb‑ft, robust engineering, broad platform compatibility, and lasting collector appeal, it’s an iconic choice whether you’re restoring, swapping, or building a high‑performance project.

Expect to pay around US $8,000–9,000 for a new crate with warranty; used units may go for $4,000–6,000 but require additional work and verification. If going for a project swap, ensure you have all necessary accessories and wiring harnesses, and confirm installation details and warranty eligibility at the time of purchase.