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class=\u0022product--variation-field--variation_field_product_description__30401 field field--name-field-product-description field--type-text-with-summary field--label-hidden field__item\u0022\u003E\u003Cp\u003E50 States Emissions Legal (E.O. D-701-38). 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.\u003C\/p\u003E\u003Cp\u003EPPE\u0027s new 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 gray iron, the PPE Cylinder Head offers elevated fatigue strength, heat, and creep resistance, which prolongs the cylinder head\u0027s lifespan significantly. PPE Cylinder Head also shares the same heat expansion rate as the stock cast-iron cylinder block no more blown head gaskets.\u003C\/p\u003E\u003Cp\u003EEach head comes complete with upgraded valve train components. 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