New Pair 5.7L Hemi Cylinder Heads for 2003-2008 Models

New Chrysler Dodge Jeep 5.7L Hemi Cylinder Heads (Pair) – 2003–2008 Models

Premium OEM-Quality Replacement with Hardened Valve Seats

Restore your engine’s peak volumetric efficiency and legendary power with this matched pair of brand-new aftermarket cylinder heads, specifically engineered for the 2003–2008 Chrysler, Dodge, and Jeep 5.7L V8 Hemi engine series. This “zero-hour” pair is designed to address the critical thermal and structural vulnerabilities found in original factory castings. Featuring reinforced, hardened valve seats, these heads are engineered to eliminate the catastrophic “dropped valve seat” failure point prevalent in early Generation III Hemi platforms, ensuring long-term durability and peak combustion efficiency.

Utilizing a premium high-density aluminum alloy, each cylinder head is precision-machined to meet or exceed original equipment (OE) dimensional tolerances. This ensures an absolute deck surface finish for a superior head gasket seal, which is vital for maintaining high-compression performance across both cylinder banks. Unlike remanufactured units that may have already undergone multiple heat cycles, these brand-new castings provide a fresh structural foundation with superior resistance to thermal fatigue and micro-cracking. Whether you are performing a top-end overhaul on a Dodge Ram 1500, a Chrysler 300C, or a Jeep Grand Cherokee, this reinforced Hemi pair provides the structural integrity and cooling capacity required to regain your 5.7L’s original reliability.

🛠️ In-House Machining Process

• Debris-Free Preparation: Every new casting is chemically cleaned and blown out to remove all residual machining oils, metal shavings, and manufacturing debris. This ensures your oiling system remains uncontaminated from the first start-up.

• In-House Precision Machining: Unlike “shelf-stock” heads, we perform all final machine work in-house. This includes final guide sizing and precision valve seat cutting to ensure perfect geometry and clearances before the head reaches the assembly bench.

• Pressure & Integrity Testing: To go beyond the factory standard, we pressure-test every head to 60 PSI. This verifies that the casting is free of porosity leaks or internal defects that could compromise the cooling or oiling systems.

• Dimensional Inspection: Our technicians perform a multi-point inspection of the gasket-sealing surface and bore alignment. This ensures the head is perfectly flat and meets tight OEM tolerances for a flawless fit.

• Professional Assembly & Setup: Valvetrain components are installed and verified in a clean-room environment. We check spring heights and seal seating to ensure the assembly is balanced and ready for high-performance use.

• Vacuum-Seal Verification: Every intake and exhaust port is Vacuum Tested. This guarantees a 100% airtight seal between the valves and seats, ensuring maximum compression and peak performance right out of the box.

📊 Technical Specifications

• Engine Size: 5.7L Hemi
• Model Years: 2003–2008
• Condition: Brand New
• Material: High-Grade Aluminum
• Valve Seats: Hardened for Enhanced Durability
• Components Included: Complete Pair (Left and Right Sides)
• Core Return Required
• Each Cylinder Head Includes: Valves and Springs Installed

🚛 Fitment Data

Common Applications:

• Chrysler 300: 2006–2008 Chrysler 300 (5.7L)
• Chrysler Aspen: 2007–2008 Chrysler Aspen (5.7L)
• Dodge Charger: 2006–2008 Dodge Charger (5.7L)
• Jeep Commander: 2006–2008 Jeep Commander (5.7L)
• Dodge Ram 1500: 2006–2008 Dodge Ram 1500 (5.7L)
• Dodge Ram 2500: 2006–2008 Dodge Ram 2500 (5.7L)
• Dodge Ram 3500: 2006–2008 Dodge Ram 3500 (5.7L)
• Dodge Durango: 2006–2008 Dodge Durango (5.7L)
• Jeep Grand Cherokee: 2006–2008 Jeep Grand Cherokee (5.7L)
• Dodge Magnum: 2006–2008 Dodge Magnum (5.7L)