Brand New Pair 6.5 OHV GM Diesel Aftermarket Cylinder Heads (90° Angle) W/ Head Gasket Set and Bolts, Water Pump & Timing Set

GM 6.5L OHV Diesel Engine Rebuild Kit – 90° Angle (Casting #567)

Heavy-Duty Casting #567 – Complete with Valves and Springs

Engineered for the high-torque GM 6.5L OHV Indirect Injection (IDI) Diesel series, this brand-new aftermarket cast iron cylinder head is the definitive solution for restoring peak compression and thermal efficiency. This specific casting features the late-model #567 design, distinguished by its 90-degree intake manifold bolt angle. Utilizing a high-density cast iron alloy, each unit is manufactured to meet or exceed original equipment (OE) dimensional tolerances, ensuring a superior head gasket seal and optimal volumetric efficiency.

Each cylinder head undergoes a rigorous factory inspection protocol—including precision deck surfacing and high-pressure leak testing—to eliminate potential failure points such as the micro-cracking between valve seats common in high-mileage OE castings. This brand-new casting provides a “zero-hour” foundation for your top-end rebuild, offering superior structural integrity and thermal stability under heavy towing and high-EGT conditions. Whether you are maintaining a Chevrolet Silverado, GMC Sierra, or a heavy-duty H1 Hummer, this #567 head provides the durability required to regain your 6.5L Diesel’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 Type: GM 6.5L V8 OHV Diesel
• Intake Angle: 90 Degrees
• Casting Number: #567
• Each Cylinder Head Includes: Valves and Springs Installed
• Condition: New
• Additional Hardware: Head Gasket Set and Bolts, Water Pump and Timing Set

🚛 Fitment Data

Common Applications (90° Angle Models):

• Chevy/GMC 2500 & 3500 Pickup: 1992–2002 (6.5L Diesel)
• Chevy/GMC 1500 Pickup: 1994–1998 (6.5L Diesel)
• Chevy Suburban / Tahoe / Yukon: 1994–1999 (6.5L Diesel)
• G/K/C Series Trucks & Vans: Various Turbo & Non-Turbo Models
• Hummer (Non-Turbo): Check intake angle before ordering

Fitment Note: If you have a Hummer Turbo or Turbo Van requiring a 60° angle head, please refer to our alternative listing.