ARP 625+ Custom Age Headstuds for 2.0/2.3L Ecoboost Engines (Focus ST, Focus RS, Ecoboost Mustang)

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These studs have an even higher UTS (closer to the 280 ksi limit of the material) than the previous L19/H11 offerings and have the added benefit of better corrosion resistance. We also upgraded the nuts in this head stud package to a heat treated version which have a lower failure rate when paired with an equally heat treated stud. The best part about the new 625+ studs is that we are able to keep the price the same. Our 10mm head stud kit comes with upgraded nuts and washers along with a special assembly lube that has been tested to provide the most accurate torque spec of any lube on the market. Installation Instructions - (Must be followed for our built engines) Show more