Reinforced cylinder head studs ARP PORSCHE 911 2.0 2.4 2.7/930 3.0 3.2/964 3.6

This kit of reinforced cylinder head studs for PORSCHE 911 2.0 2.4 2.7/930 3.0 3.2/964 3.6 is made up of ARP studs, ARP washers and ARP nuts.

You will find the fitting instructions in the "Download" tab above.

Coming from the aerospace industry, Gary Holzapfel founded the ARP (Automotive Racing Products) brand in the early 1970s to address a major problem in motorsport: engine failure caused by bolts and studs that were not strong enough. At the time, no manufacturer was able to meet this need. Today ARP offers thousands of references across different ranges and product types, such as head bolts, main bearing bolts, con rod bolts... Depending on the application, ARP offers different fastener ranges (materials):

• 8740: a chrome-molybdenum steel with standard strength properties, well suited to tuned engines. This steel offers a tensile strength of between 1240 and 1447 N/mm2.
• ARP2000: stronger than 8740, the ARP2000 alloy can withstand clamping/tensile loads of up to 1516 N/mm2. This range of fasteners is frequently used on track and drag cars and can be used with hydrogen.
• L19: a higher grade treated steel offering tensile and fatigue strength properties well above the 8740 and ARP2000 ranges. Its tensile strength can reach up to 1792 N/mm2. This material is more sensitive to corrosion and must therefore be kept oiled and not exposed to moisture. Hydrogen use is not recommended with this range.
• CA625+ (Custom Age 625 Plus): this "super-alloy" offers significantly higher technical properties while remaining resistant to corrosion and oxidation. Its tensile strength can reach up to 1930 N/mm2.

All ARP fasteners are designed and manufactured in the United States. Manufacturing of ARP fasteners begins with cold or hot forging, followed by a heat treatment (which varies according to the range) and then shot peening to remove any irregularities. Precise grinding is then carried out to achieve perfect concentricity, followed by threading. Finally comes the finish, during which a coating is applied, such as black chrome-molybdenum oxide or polished stainless steel, depending on the product range.

Each kit is supplied with fitting grease and an instruction sheet indicating:

• The installation steps
• The thread size of the bolts/studs/nuts
• The torque value
• The tightening procedure