The Chrysler 6.4L HEMI (392) is a 6,417 cc, naturally aspirated V8 petrol engine introduced in 2011 for high — performance applications. It features a 90 — degree V8 architecture with dual overhead camshafts, variable valve timing (VVT), and hemispherical combustion chambers. In SRT applications, it delivers 485 hp (362 kW) and 475 lb — ft (644 Nm) of torque, providing strong, linear power delivery characteristic of large — displacement American V8s.
Fitted to performan…
Production years 2011–2023 meet EPA Tier 2 Bin 5 standards; 2024+ models comply with updated EPA standards depending on application (EPA Engine Family Code: CCAHXX.21HBP).
The Chrysler 6.4L HEMI (392) is a 6,417 cc V8 engineered for high-performance muscle cars and SUVs (2011–Present). It combines variable valve timing with a robust cast-iron block to deliver strong, linear power and torque. Designed to meet EPA Tier 2 Bin 5 and later standards, it balances brute force with modern emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 6,417 cc | |
Fuel type | Petrol | |
Configuration | V8, 90-degree, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 103.9 mm × 94.6 mm | |
Power output | 485 hp (362 kW) @ 6,100 rpm | |
Torque | 475 lb-ft (644 Nm) @ 4,300 rpm | |
Fuel system | Sequential multi-port fuel injection (SFI) | |
Emissions standard | EPA Tier 2 Bin 5 (2011-2023); Updated EPA (2024+) | |
Compression ratio | 10.9:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC with VVT | |
Oil type | MOPAR SAE 5W-20 (MS-6395) | |
Dry weight | 500 lbs (227 kg) |
The Chrysler 6.4L HEMI (392) was used across Dodge and Jeep performance platforms with longitudinal mounting. This engine received platform-specific adaptations—reinforced mounts in the Charger and unique intake manifolds in the Challenger—and from 2015 received revised lifter designs, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The 6.4L HEMI's primary reliability risk is lifter failure, with elevated incidence in high-RPM or track-driven vehicles. Chrysler TSB 09-002-15 documents numerous cases requiring replacement before 50,000 miles, while NHTSA complaints frequently cite related noise and performance loss. Aggressive driving and extended oil intervals increase wear, making oil quality and change frequency critical.
Analysis derived from Chrysler technical bulletins (2011-2024) and NHTSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
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The 6.4L HEMI is generally robust with proper maintenance, though early models (2011-2014) had lifter failure concerns. Post-2015 revisions significantly improved durability. Regular oil changes with MOPAR 5W-20 and avoiding sustained high-RPM operation greatly enhance longevity. Many examples exceed 150,000 miles without major issues.
The most common issues are lifter failure (especially pre-2015), oil cooler line leaks, PCV system clogging, and exhaust manifold bolt breakage. These are well-documented in Chrysler TSBs. Lifter tick is the most frequent complaint, often requiring a full lifter replacement.
This engine powers Dodge Challenger SRT 392/Scat Pack (2015+), Dodge Charger SRT 392/Scat Pack (2015-2023), Jeep Grand Cherokee SRT (2012-2021), and Dodge Durango SRT 392 (2018-2023). It's exclusive to high-performance SRT or Scat Pack trims within these model lines.
Yes. The 6.4L responds well to tuning. Simple ECU flashes can gain 20-40 hp. Bolt-on upgrades (intake, exhaust, pulleys) combined with a tune can yield 50-70+ hp gains. The stock internals are strong and can handle moderate power increases reliably. Forced induction requires significant reinforcement.
Fuel economy is modest due to the large displacement. Expect 14-15 mpg city and 22-23 mpg highway in a Challenger or Charger. The heavier Grand Cherokee and Durango SRT models typically return 13 mpg city and 19 mpg highway. Real-world mixed driving usually averages 16-18 mpg.
Yes. The 6.4L HEMI is an interference engine. If the timing chain fails or jumps, the pistons will collide with the open valves, causing catastrophic internal damage. Fortunately, the timing chain is very robust and rarely fails if oil is maintained properly.
Chrysler mandates MOPAR SAE 5W-20 engine oil meeting specification MS-6395. This specific viscosity and formulation are critical for proper operation of the VVT system and to minimize lifter wear. Using the correct oil and changing it every 6,000 miles (or 3 months) is essential for engine health.
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