Professional Series Cylinder Head Stud Kit for VW/Audi

The ARP 204-4706 Professional Series Cylinder Head Stud Kit is engineered for exceptional clamping force and durability, making it a preferred choice for engine builders and performance enthusiasts. Constructed from premium-grade 8740 alloy and a proprietary ARP2000 alloy, these studs are heat-treated to a tensile strength of 220,000 psi, exceeding "aircraft" quality standards. This rigorous heat-treatment process, applied vertically in special racks, ensures complete penetration and superior material integrity compared to lesser quality studs. ARP meticulously centerless grinds each stud to achieve near-perfect concentricity, resulting in exceptionally straight components. This precision manufacturing ensures that gaskets and cylinder heads align flawlessly during installation, a testament to ARP's commitment to exacting tolerances. Furthermore, ARP studs are thread-rolled after heat-treat, a more costly but significantly stronger process that provides approximately 2000% greater fatigue strength than studs threaded before heat-treatment. The kit includes specially undercut studs for certain engines, which equalize stud stretch for consistent clamping force and compensate for head gasket compression, helping to prevent blown head gaskets and ensure optimal engine sealing. This kit is specifically designed for VW/Audi 1.6L and 1.9L Turbo and Non-Turbo engines manufactured between 1982 and 2002. The black oxide finish and 12-point nuts offer corrosion resistance and reliable torque application. The package includes nuts, washers, and ARP Ultra-Torque lubricant. Required socket sizes are 14mm 12-point and a 5mm Allen key. These head studs are proudly made in the USA.