ARP 204-4206 Porsche 911 Head Stud Kit – 8740 Chromoly Fasteners for 2.0L-3.8L Air-Cooled Engines

Description

The ARP 204-4206 head stud kit is designed for Porsche 911 and 930 Turbo air-cooled engines ranging from 2.0L to 3.8L displacement. Manufactured from premium 8740 chromoly steel, these studs are heat-treated for high tensile strength and finished in black oxide for corrosion resistance. The kit includes 24 studs, hardened washers, and 12-point nuts engineered for precise cylinder head clamping in performance and restoration applications. || Built as a direct replacement for factory Dilivar head studs, the ARP 204-4206 kit supports improved head sealing in turbocharged, high-compression, and rebuilt air-cooled Porsche engines. The lightweight stud design and precision-machined threads help maintain consistent torque loading during thermal cycling common in Porsche flat-six engines. Compatible applications include multiple Porsche 911 and 930 Turbo models from 2.0L through 3.8L configurations. || ARP cold-forges and heat-treats these fasteners to maintain molecular integrity under demanding engine loads. The black oxide finish supports long-term durability while the included hardened washers improve torque accuracy during assembly. Whether restoring a classic 911 or building a boosted 930 Turbo engine, the 204-4206 kit delivers the clamping force required for reliable cylinder sealing.