New Pair GMC Chevrolet Truck 454 7.4L Cylinder Heads – Cast Iron 1996-2000 # 279

New Pair GMC Chevrolet 454 7.4L Cylinder Heads – Cast Iron 1996–2000 Casting #279

Professional-Grade Replacement – Direct Fit – OEM Quality

Upgrade your engine with this premium pair of 454 7.4L GM Cylinder Heads (Casting #279), meticulously engineered by Heavy Duty Parts Company for those who demand uncompromising reliability. Specifically tailored for 1996–2000 Chevrolet and GMC trucks, these high-grade cast iron heads are the definitive solution for heavy-duty performance and long-term durability.

To ensure a truly seamless “bolt-on” experience, each head comes fully preloaded with high-quality valves and springs, eliminating the guesswork and specialized tools usually required for assembly. Whether you are hauling heavy loads or restoring a classic workhorse, these cylinder heads are designed to breathe new life into your vehicle, restoring its original horsepower, torque, and fuel efficiency. Don’t just repair your engine—reinforce it with professional-grade components built to outlast the competition.

🛠️ 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: 7.4L (454)
• Casting Number: 279
• Material: Premium-Grade Cast Iron
• Condition: New
• Vehicle Compatibility: 1996–2000 GM Trucks and Vans
• Core Return Required
• Each Cylinder Head Includes: Valves and Springs Installed

🚛 Fitment Data

Common Applications:

• Chevrolet 2500 Pickup: 1996–2000 Chevrolet 2500 Pickup (8-454 (7.4L))
• Chevrolet 30 Van: 1996 Chevrolet 30 Van (8-454 (7.4L)) 30 HD
• Chevrolet 3500 Pickup: 1996–2000 Chevrolet 3500 Pickup (8-454 (7.4L))
• Chevrolet Express 3500 Van: 1996–2000 Chevrolet Express 3500 Van (8-454 (7.4L))
• GMC 2500 Pickup: 1996–2000 GMC 2500 Pickup (8-454 (7.4L))
• GMC 3500 Pickup: 1996–2000 GMC 3500 Pickup (8-454 (7.4L))
• GMC 3500 Van: 1996 GMC 3500 Van (8-454 (7.4L)) 3500 HD
• GMC Savana 3500 Van: 1996–2000 GMC Savana 3500 Van (8-454 (7.4L))
• Chevrolet Suburban 2500: 1996–1999 Chevrolet Suburban 2500 (8-454 (7.4L))