01-04 GM 6.6L Duramax Ported Cast Iron Cylinder Head (One) LB7 Pacific Performance Engineering - 110100111 2007-chevrolet-silverado-2500-hd-classic-esi4523573 Cooler oil lubricates better which

Cooler oil lubricates better which helps increase transmission service life and reduce service costs

street or racing

and dual four-inch ceramic-coated exhaust tips

The OEM filter bypass valve comes with no seal of any kind

01-04 GM 6.6L Duramax Ported Cast Iron Cylinder Head (One) LB7 Pacific Performance Engineering - 110100111 2007-chevrolet-silverado-2500-hd-classic-esi4523573 Cooler oil lubricates better whichThe OEM Duramax cast aluminum cylinder heads fall short over time the differing heat expansion rates between the 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 ported LB7 Cast Iron Cylinder Head is the ultimate upgrade for