XDP X220 Series Head Stud Kit XD3001HSUpgrade the factory head bolts in your 2003 2007 Ford 6. 0L Powerstroke with the XDP X220 Series Head Stud Kit XD3001HS. With only four head bolts per cylinder, and just 10 per bank, the 6. 0 engine is infamous for cylinder head gasket issues. When adding horsepower and torque to your Powerstroke, or even in stock applications as preventive maintenance, upgrading the factory head bolts is a necessity to avoid a lifted cylinder head, or a failed head