2006-2006 Chevrolet Silverado 2500 HD (Engine Designation: LBZ & Liter: 6.6 & Cylinder: 8 & Block: V | Qualifier: CARB Executive Order D-550-4); 2006-2006 Chevrolet Silverado 3500 (Engine Designation: LBZ & Liter: 6.6 & Cylinder: 8 & Block: V | Qualifier: CARB Executive Order D-550-4); 2006-2006 GMC Sierra 2500 HD (Engine Designation: LBZ & Liter: 6.6 & Cylinder: 8 & Block: V | Qualifier: CARB Executive Order D-550-4); 2006-2006 GMC Sierra 3500 (Engine Designation: LBZ & Liter: 6.6 & Cylinder: 8 & Block: V | Qualifier: CARB Executive Order D-550-4); 2007-2007 Chevrolet Silverado 2500 HD Classic (Engine Designation: LBZ & Liter: 6.6 & Cylinder: 8 & Block: V | Qualifier: CARB Executive Order D-550-4); 2007-2007 Chevrolet Silverado 3500 Classic (Engine Designation: LBZ & Liter: 6.6 & Cylinder: 8 & Block: V | Qualifier: CARB Executive Order D-550-4); 2007-2007 GMC Sierra 2500 HD Classic (Liter: 6.6 & Cylinder: 8 & Block: V | Qualifier: CARB Executive Order D-550-4); 2007-2007 GMC Sierra 3500 Classic (Liter: 6.6 & Cylinder: 8 & Block: V | Qualifier: CARB Executive Order D-550-4)