Fits: 2004.5-2010 GM 6.6L Duramax LLY/LBZ/LMMThe PPE Cast Iron Cylinder Head are an upgraded for the worn out or leaking cylinder head in your 2004.5-2010 Gm 6.6L Duramax. This cast iron cylinder head has a valvetrain with chromoly-silicone alloy intake valves and 214N alloy exhuast valves that have...