CNC Ported Cast Iron Cylinder Head

Features:

• Fits 2004.5-2010 6.6L Duramax trucks
• Specially alloyed gray cast iron construction
• 5-axis CNC ported for better airflow
• Improves power and throttle response
• Helps reduce turbo lag
• Resists warping, cracking, and heat damage
• Helps prevent head gasket scrubbing
• Matches cast iron block expansion rate
• Premium Stellite-reinforced exhaust valves
• Nitridated valves resist abrasion
• Includes installed valvetrain components
• Requires LBZ/LMM glow plugs on LLY

Built To End The Head Gasket Headaches For Good

If you are tired of worrying about cracked factory heads or repeated head gasket failures, the PPE CNC Ported Cast Iron Cylinder Head is the upgrade your Duramax has been waiting for. Designed specifically for 2004.5-2010 Silverado and Sierra 2500HD and 3500HD trucks with the 6.6L Duramax, this heavy-duty cylinder head replaces the weak points found in the factory aluminum design with a far stronger cast iron construction. Because the PPE head shares the same expansion rate as the stock cast iron engine block, it helps eliminate the head gasket scrubbing issues that plague many hard-worked diesel trucks. Additionally, the alloyed gray iron casting delivers impressive resistance against warping, cracking, and extreme heat, making it an excellent choice for towing, tuned applications, or long-term reliability. The CNC ported intake and exhaust runners also wake the engine up with smoother airflow and better throttle response, helping the truck feel stronger and more responsive under load. What's more, PPE includes the valvetrain components, rocker arm dowels, and freeze plugs already installed, so you are not stuck chasing extra parts before installation. From daily-driven work trucks to serious performance builds, this cylinder head gives your Duramax the durability and confidence the factory setup simply cannot match.

Precision CNC Porting Unlocks Reliable Duramax Performance

PPE engineered this cast iron cylinder head to improve airflow efficiency while maintaining the durability needed for demanding diesel applications. The 5-axis CNC porting process carefully reshapes both the intake and exhaust ports to create smoother airflow characteristics without compromising wall thickness or structural integrity. This optimized airflow helps improve horsepower, torque delivery, throttle response, and even turbo spool characteristics, all while reducing unnecessary engine stress. Additionally, the cylinder head uses premium 21-4N exhaust valves with Stellite reinforcement for improved heat tolerance and long-term durability under high exhaust temperatures. Fully nitridated valves further increase abrasion resistance, helping the valvetrain stand up to extended heavy use and elevated cylinder pressures. PPE also designed these heads with improved thermal efficiency compared to aluminum alternatives, allowing them to better handle sustained heat cycles without distortion or fatigue. Each head arrives ready to install, making the upgrade process far more straightforward for shops and home builders alike. For LLY-equipped trucks, PPE specifies the use of LBZ or LMM glow plugs to ensure proper compatibility and performance.

Fitment: 2004.5, 2005, 2006, 2007, 2008, 2009, 2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Notes:

• Sold as one cylinder head
• Designed for LLY, LBZ, and LMM engines
• Fits 2004.5-2010 GM 6.6L Duramax applications
• LLY engines require LBZ/LMM glow plugs
• Built to replace failure-prone aluminum heads
• Intended to reduce head gasket scrubbing issues
• Extreme-performance builds may need valve seat changes
• PPE recommends oversized exhaust valve seats for high heat
• Includes valvetrain components, dowels, and freeze plugs
• Made for improved reliability and long-term durability