2001-2004 GM 6.6L Duramax CNC Ported Cast Iron Cylinder Head (One Head) LB7 2017-2019-ford-f-250-super-duty-8-cyl-6-2-liter-esi6121947 Beware of inferior bleeder screws

Beware of inferior bleeder screws without an air channel

The entire rotating assembly is balanced and blueprinted

mandrel bent 304 stainless steel tubing

Excess oil on the crankshaft can cut horsepower

6L) Engine Oil Pan is your best choice for increased strength and lower oil temps

2001-2004 GM 6.6L Duramax CNC Ported Cast Iron Cylinder Head (One Head) LB7 2017-2019-ford-f-250-super-duty-8-cyl-6-2-liter-esi6121947 Beware of inferior bleeder screwsDuramax Ported Cast Iron Cylinder Head 2001 2004 GM 6. 6L (One Head) LB7 The 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.