ARP uprated cylinder head studs BMW M3 E30 S14B23

This kit of uprated cylinder head studs for the BMW M3 E30 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 uprated head gaskets for the BMW S14B23 engine:

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 those needs. Today ARP offers thousands of part numbers across different ranges and product types, such as head bolts, main bearing bolts and con rod bolts. Depending on the application, ARP offers several material ranges:

• 8740: a chrome-molybdenum steel with standard strength properties that are entirely suitable for prepared engines. 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 widely used on circuit and drag cars and can be used with hydrogen.
• L19: a treated premium grade steel offering tensile and fatigue strength properties clearly superior to the 8740 and ARP2000 ranges. Its tensile strength reaches up to 1792 N/mm2. This material is more sensitive to corrosion and must therefore 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 also resisting corrosion and oxidation. Its tensile strength can reach 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 is applied, which differs from one range to another, and shot peening follows to remove any irregularity. Precise grinding then gives perfect concentricity before the thread is cut. Finally comes the finishing stage, where a coating is applied, either black chrome-molybdenum oxide or a stainless steel polish depending on the product range.

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

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