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These engine cylinder heads are direct replacements designed to service Caterpillar C13 engines. The head's intent is to sit atop the engine block creating a housing for cylinders and valves. The head creates and maintains a seal necessary for combustion in the engine. These parts are CNC machined to meet tight tolerances and exact measurements. A vital part in any engine rebuild. Specific Features & Benefits Castings are made of improved materials to avoid warpage and prevent stress risers Precisely machined with state of the art CNC machining Cylinders are vacuum tested to ensure proper seal between valve seat and valve Cylinder heads are pressure tested for fuel and water leaks Comes ready with new springs and valves Meets OEM form; fit and function