BMW M50 M52 S50 S52 ARP Head Stud Kit Custom Age 625+

  In collaboration with ARP, we offer a unique material called Custom Age 625+. This material has a tensile strength of 260 ksi, which is substantially higher than the 190 ksi of the ARP 2000 head stud. It's an ideal choice for individuals who want to push the limits of their M50/M52/S50/S52 Turbocharged and Supercharged engine builds and require a stronger head stud. Using Custom Age 625+ head studs allows you to increase boost levels without the cylinder head lifting, making it unnecessary to use an 11mm stud or drill and tap your block. Using Custom Age 625+ head studs enables you to increase boost levels without worrying about the cylinder head lifting. This means that you won't need to use an 11mm stud or drill & tap your block. Installation Instructions:  1. To ensure proper thread engagement and accurate torque readings, clean ALL threads in the block. Chase if necessary with ARP Thread Chaser. 2. Clean and inspect all hardware prior to installation. Look for obvious d