ARP Pro Series Cylinder Head Stud Kit, 1.6L/1.9L Diesel

The ARP 204-4706 is a Pro Series cylinder head stud kit engineered specifically for VW/Audi 1.6L and 1.9L diesel engines, including turbo and non-turbo variants, as well as TDI models. These studs are constructed from premium 8740 chromoly steel, chosen for its exceptional strength and durability under demanding engine conditions. ARP meticulously cold-forges these head studs to ensure molecular integrity, followed by heat treatment prior to thread rolling and machining. This process significantly enhances their strength and resistance to fatigue, making them ideal for engine rebuilds and performance applications. The kit helps to prevent common issues like blown head gaskets and ensures optimal engine sealing for reliable performance. The studs feature M12 x 1.75 thread size and a 135mm length, designed for a precise fitment within the specified engine applications. Included in the kit are ten ARP2000 head studs. It is important to note that proper installation is crucial for the longevity and performance of these studs. ARP generally recommends installing studs dry into the block (without thread-locking compounds) and utilizing proper lubrication on the nut-facing side during assembly. Some sources also mention the need for block and head preparation, including honing, to prevent distortions when using performance studs.