Upgrade your 2004.5-2010 GM 6.6L Duramax LLY / LBZ / LMM with PPE's Ported Cast Iron Cylinder Heads, designed for superior durability and performance. Over time, OEM cast-aluminum cylinder heads can fall short due to the mismatch in heat expansion rates between the aluminum heads and cast-iron block, leading to head gasket issues, warping, or even cracking in high-performance situations.

PPE’s ported cast iron heads, made from high-quality alloyed gray iron, are engineered to eliminate these common problems. The cast iron construction matches the heat expansion rate of the stock engine block, eliminating head gasket scrubbing and blown gaskets. With superior fatigue strength, heat resistance, and creep resistance, these heads are built to last, even in extreme heat environments. Cast-in fuel injector cups also solve the OEM injector cup leaking issues for increased reliability. The CNC porting process improves airflow, delivering enhanced power, fuel efficiency, and throttle response while reducing turbo lag and engine stress. The ports are smoothed and optimized for consistency, delivering increased horsepower and torque without sacrificing reliability. Each cylinder head is tailored to exact specifications to ensure consistent and optimized airflow dynamics, providing the performance and longevity you expect for your Duramax engine. Each head comes with a 3-year unlimited mileage warranty. Sold individually