ARP Performance Head Studs VAG 1.8 16V KR 2.0 16V 9A ABF

This kit of performance cylinder head studs for the VAG 1.8/2.0 16V engine is made up of 10 ARP studs, 10 ARP washers and 10 ARP nuts.

You will find the fitting instructions in the “Download” tab above.

Below (click on the image) you will find the performance head gaskets for VAG 9A, ABF and KR engines:

Coming from the aerospace industry, Gary Holzapfel created the ARP brand (Automotive Racing Products) in the early 1970s to answer a major problem in motorsport: engine failures caused by bolts and studs that were not strong enough. At the time no manufacturer was able to meet that need. Today ARP offers thousands of part numbers across several ranges and product types, such as head bolts, main studs and con rod bolts. Depending on the application, ARP offers different material ranges of fasteners:

• 8740: a chromoly steel whose standard strength properties are perfectly suited to a built engine. This steel offers a tensile strength of between 1240 and 1447 N/mm².
• ARP2000: stronger than 8740, the ARP2000 alloy withstands clamping and tensile loads of up to 1516 N/mm². This range is frequently used on circuit and drag cars and can be used with hydrogen.
• L19: a premium treated steel offering tensile and fatigue strength clearly above the 8740 and ARP2000 ranges. Its tensile strength reaches up to 1792 N/mm². This material is more sensitive to corrosion, so it must be kept oiled and away from moisture. Hydrogen is not recommended with this range.
• CA625+ (Custom Age 625 Plus): this “super alloy” has clearly superior technical properties while resisting corrosion and oxidation. Its tensile strength reaches 1930 N/mm².

All ARP fasteners are designed and manufactured in the United States. Production starts with cold or hot forging, then a heat treatment (which differs from one range to another) is applied and shot peening removes any irregularities. Precise grinding follows to obtain perfect concentricity, then the thread is produced. Finally comes the finish, where a coating such as black chromoly oxide is applied or the stainless steel is polished, depending on the product range.

Every kit is supplied with assembly lube and an instruction sheet stating:

• the fitting steps
• the thread of the bolts, studs and nuts
• the tightening torque
• the tightening procedure