If you are building real power with your Zetec, you will appreciate the ARP Head Stud Kit. Head studs provide more accurate and consistent torque loading. They also ensure proper alignment of the cylinder head and gasket. If you are making more than stock horsepower levels, why trust a head bolt that is only engineered to work with 130 hp? Higher compression, turbos, superchargers all put more stress on the head bolts...it only makes sense to upgrade to high-quality head studs such as ARP! Kit includes 10 head studs, hardened washers, nuts and lubricant.