Description
The 201-4302 ARP2000 head studs from ARP are custom-designed for the iron block U.S model versions of the inline 6-cylinder engines found in E34/E36 chassis, specifically the M5x/S5x engines. Due to their exceptional versatility and high-performance potential, these engines have gained popularity among enthusiasts for engine swaps into different chassis. They are a popular choice for a range of motorsport disciplines such as road racing, hill climbs, time attack, drifting, and drag racing.
The installation of ARP head studs on BMW M50/M52/S50/S52 engines has several advantages, such as increased clamping force and enhanced head gasket sealing, which can prevent head gasket failure. This is especially crucial for high-performance or turbocharged engines, as the increased cylinder pressure puts additional stress on the head gasket and bolts.
Proper installation of ARP head studs requires strict adherence to the manufacturer's instructions and using the correct torque specifications and sequence. Additionally, it's essential to check the cylinder head and block for flatness and resurface them if needed to ensure a proper seal.
Installation Instructions:
1. To ensure proper thread engagement and accurate torque readings, clean ALL threads in the block. Chase if necessary with ARP Thread Chaser.
2. Clean and inspect all hardware prior to installation. Look for obvious defects or shipping damages, plus proper fit, length and dimension.
3. If the cylinder head studs protrude into a water jacket, lubricate the block threads of the studs with ARP THREAD SEALER.
4. Screw studs into the block “HAND TIGHT ONLY”.
5. Install the cylinder head(s) and check for binding or misalignment.
6. Lubricate the stud threads, nuts and washers with ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT.
Then install the washers and the nuts onto the studs and tighten them hand tight.
ARP recommends using the ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT that is provided with each kit as opposed to motor oil. This is due to higher friction on the studs as well as inconsistencies in the clamping force of the fasteners when motor oil or other low quality lubricants are used.
PRELOAD (TORQUE) RECOMMENDATIONS
7. Following the manufacturer-recommended torque sequence tighten the nuts in steps 1-3
ARP2000
Step 1: Tighten to 25 ft-lbs.
Step 2: Tighten to 50 ft-lbs.
Step 3: Tighten to 75 ft-lbs.