Description
The Mopar® Performance 392 CID 6.4L Gen III HEMI® Crate Engine (P/N 68303090AC) produces a factory-rated 485 horsepower and 475 lb-ft of torque. Based on the factory manual transmission specification, this complete long block assembly is manufactured without MDS (Multi-Displacement System) lifters or solenoids, delivering a simplified, high-RPM valvetrain built for pure performance. The assembly includes a water pump, front-sump oil pan, intake manifold, throttle body, fuel injectors, coil packs, and flywheel/clutch assembly.
NOTE: Exhaust manifolds are not included. Premium 91+ octane fuel is required for optimal performance and knock protection with 10.9:1 compression. This is a universal crate engine and not a direct plug-and-play replacement for all factory 5.7L or 6.4L production vehicles (Ram truck and other chassis applications require installation modifications). Knowledge and execution of any powertrain control integration, oil pan clearance, and vehicle modifications are solely the responsibility of the installer.
| Specification | Detail |
|---|---|
| Engine Type | 392 CID (6.4L) Gen III HEMI® (Non-MDS) |
| Horsepower | 485 HP @ 6,100 RPM* |
| Torque | 475 lb-ft @ 4,100 RPM |
| Compression Ratio | 10.9:1 |
| Bore x Stroke | 4.090" Bore x 3.720" Stroke (103.9mm x 94.6mm) |
| Engine Block | Deep-skirt cast iron with cross-bolted 4-bolt powder-metal main caps |
| Crankshaft | Forged steel |
| Cylinder Heads | A356-T6 aluminum, hemispherical combustion chambers (Apache Architecture) |
| Chamber Volume | 74cc |
| Valves (Int / Exh) | 2.140" hollow-stem intake / 1.650" sodium-filled exhaust |
| Camshaft Type | Hydraulic roller (Non-MDS) |
| Valve Lift (Int / Exh) | 0.571" / 0.536" |
| Duration @ 0.050" (Int / Exh) | 221° / 225° |
| Peak RPM | 6,400 RPM |
*To achieve the advertised 485 HP / 475 lb-ft crank output rating, the engine must be paired with genuine Mopar Engine Controller Kit P/N 77072451AG (Manual Transmission) or P/N 77072454AI (Automatic Transmission).
Warranty Information: Mopar HEMI crate engines feature a 3-year / 100,000-mile limited parts warranty when purchased on the same invoice as the genuine Mopar HEMI Engine Controller Kit. If purchased without the Mopar controller kit, coverage is limited to a 90-day parts-only warranty.
Recommended Installation & Accessory Components:
- P/N 77072451AG: Mopar Engine Controller Kit (Manual Transmission)
- P/N 77072454AI: Mopar Engine Controller Kit (Automatic Transmission)
- P/N 302-61: Holley Gen III HEMI Mid-Sump Swap Oil Pan
- P/N 77072448: Power Steering Add-On Kit
- P/N 77072492: Front End Accessory Drive (FEAD) Kit
- P/N 77072493: A/C Expansion Kit
Details
Shipping Information
- H40.00"
