Description
Own the heart of the modern muscle era with the legendary Mopar® Performance 345 CID 5.7L Gen III HEMI® engine. Factory-rated at 383 horsepower and 417 lb-ft of torque in manual transmission trim, this engine platform eliminates the failure-prone factory MDS (Multi-Displacement System) hardware, delivering a simplified, robust valvetrain foundation built for reliable street and strip performance.
Important Configuration Note: Long Block Assembly (Not Turnkey)
This assembly is a core long block consisting of the short block and assembled cylinder heads with valvetrain. It requires a timing cover, water pump, oil pan, valve covers, intake manifold, throttle body, sensors, exhaust manifolds/headers, and accessory drive components to complete the installation in your vehicle.
NOTE: Exhaust manifolds are not included. Knowledge and execution of any powertrain control integration, accessory drive selection, and chassis modifications are solely the responsibility of the installer.
| Specification | Detail |
|---|---|
| Engine Type | 345 CID (5.7L) Gen III HEMI® (Non-MDS) |
| Horsepower | 383 HP @ 5,600 RPM* |
| Torque | 417 lb-ft @ 4,400 RPM |
| Compression Ratio | 10.5:1 |
| Bore x Stroke | 3.917" Bore x 3.578" Stroke (99.5mm x 90.9mm) |
| Engine Block | Deep-skirt cast iron with cross-bolted 4-bolt powder-metal main caps |
| Crankshaft | Forged alloy steel |
| Connecting Rods & Pistons | Forged powdered metal I-beam rods; cast aluminum alloy pistons with low-friction skirts |
| Cylinder Heads | A356-T6 cast aluminum, hemispherical combustion chambers |
| Valves (Int / Exh) | 52.1mm (2.05") intake / 39.4mm (1.55") exhaust |
| Camshaft Type | Hydraulic roller (Non-MDS profile) |
| Peak RPM | 5,600 RPM |
*Output rating achieved when paired with proper calibration and standalone engine management.
Warranty Information: This long block assembly is sold strictly AS-IS with no parts warranty. Intended for custom engine swaps, pre-1976 vintage street vehicles, or dedicated off-highway racing applications.
Long Block Inclusions:
- Cylinder heads fully assembled with valves, springs, and retainers
- Cast iron Gen III HEMI® engine block
- Forged steel crankshaft
- Connecting rods and wrist pins
- Pistons and piston ring sets
- Performance non-MDS hydraulic roller camshaft
- Non-MDS hydraulic roller lifters
Recommended Installation & Accessory Components:
- P/N 77072448: Power Steering Add-On Kit
- P/N 77072492: Front End Accessory Drive (FEAD) Kit
- P/N 77072493: A/C Expansion Kit
- P/N 302-61: Holley Gen III HEMI Mid-Sump Swap Oil Pan
Details
Shipping Information
- H25.00"
