Evolution of the Head Stud
For a long time the only head studs available for the MZR platform were the ARP2000’s. As more cars started to creep into the 450-500whp territory, people began to lift their heads which in some cases lead to catastrophic engine failure. We began to research this problem and found that the ultimate tensile strength (UTS) of the ARP2000 studs was 190 ksi. In order to increase this number we had to look into other materials that could do the job. We started with H11 which was strong (UTS of 262 ksi), reliable, and offered many pros over the previous option. We then moved on to ARP's L19 material as it matched all of the qualities of H11 but at a cheaper price that we could pass on to the customer. We ordered 1000's of these studs before asking ourselves if there was even more we could do to bring the very best product to the table.
Intoducing the Custom Age 625+ head studs from SPEED PERF6RMANC3. These studs have an even higher UTS (closer to the 280 ksi limit of the material) than our previous L19 offering and have the added benefit of better corrosion resistance. We also upgraded the nuts in our 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. Many other platforms charge a premium for this material but we believe the price should stay the same even for a better product.
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. These are only available through SPEED PERF6RMANC3 and don’t stay in stock very long!