PPE Cast Iron Cylinder Head (04-10 6.6L Duramax Sierra 2500 HD)Find parts that fit my vehicle

Features
Specially alloyed gray cast iron liquid-cooled cylinder head
Higher strength in high temperatures and creep resistance
Eliminates head gasket scrubbing issue (blown head gasket)
Higher fatigue strength and heat resistance
Premium 21-4N, Stellite-reinforced exhaust valves
Fully nitridated valves, better abrasion resistance
High-strength Chromoly CNC machined spring retainers and locators
Upgraded springs, faster response
Ready to install - comes with all valvetrain components, rocker arm dowels, injector pads, and freeze plugs
Increased thermal efficiency compared to aluminum heads

The OEM Duramax cast-aluminum cylinder heads fall short over time - the different heat expansion rates between cast-iron engine block and cast-aluminum cylinder head cause head gasket scrubbing, and eventually blown head gaskets. The aluminum cylinder heads are also prone to warping, melting and/or cracking in high-performance applications where excessive heat is introduced.
PPE’s new LB7 Cast Iron Cylinder Head is the ultimate upgrade to your Duramax engine and eliminates any head gasket or cracking concerns. Cast from high quality alloyed grey iron, the PPE Cylinder Head offers elevated fatigue strength, heat and creep resistance, which prolongs the cylinder head’s lifespan significantly. PPE Cylinder Heads also share the same heat expansion rate as the stock cast-iron cylinder block – no more blown head gaskets.
Each head comes complete with upgraded valve train components. All valves are made of superior materials and fully nitridated. The valve springs feature higher spring rate, lighter retainers/locators, enabling faster response during higher RPMs. Alloy valve seats provide superior wear and heat resistance. The denser and stiffer material properties from the cast-iron construction also significantly reduce engine clatter.
Whether you have a damaged aluminum cylinder head or a desire for better reliability and longevity on your Duramax engine, the PPE Cast Iron Cylinder Head is undoubtedly the best choice.
*Important Note: The valve seats of the PPE Heavy Cast Iron Cylinder Heads are installed with an interference that maximizes the durability and lifespan of the cylinder heads. Such interference might not be optimal for extreme-performance applications where a significant amount of heat is created. For those applications, PPE suggests that the exhaust valve seats be replaced with higher interference (+0.006'' to +0.008'') oversized exhaust valve seats (Nominal size 34mm).

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