Turn up the BOOST! This ARP Custom Age 625+ Head Stud Kit is specifically designed for the BMW S54 engine, serving as a direct replacement for BMW OEM head bolts # 11127831862. We collaborated with ARP to engineer a kit with superior clamping force and enhanced head gasket sealing for boosted applications, eliminating risk of cylinder head lift. Custom Age 625+ studs are the ONLY choice for high-performance builds, including stroker, supercharged, and turbocharged S54 engines, where cylinder pressures are elevated, placing extra strain on the head gasket and fasteners. Because 625+ studs utilize a special alloy construction, they offer a tensile strength of 280,000 PSI–over 60,000 PSI greater than the standard ARP 2000 kit #201-4303. For applications pushing the limits of performance, where the risk of cylinder head lift is high, 625+ studs keep your engine SEALED. Whether you're building a stroker, turbocharged, or supercharged S54, the ARP 625+ Head Stud Kit ensures your engine stays SECURE. 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 manufacturers recommended torque sequence tighten the nuts steps 1-3 CA 625+ Step 1: Tighten to 35 ft-lbs. Step 2: Tighten to 70 ft-lbs. Step 3: Tighten to 100 ft-lbs. with ARP Ultra-Torque fastener assembly lubricant Bolt Torque Sequence 12 10 4 2 6 8 14 13 7 5 1 3 9 11 Please note: After initial assembly, it is necessary to allow the engine to complete a full heat cycle, then re-torque your head studs to spec. This means allowing the engine to warm up to its normal operating temperature, remain at operating temperature for several minutes to ensure each component is uniformly heated, then turned off and cooled completely to ambient temperature. BMW S54 Applications: BMW 3 Series 2000-2006 E46 M3 BMW Z3 Series 2001-2002 Z3 M BMW Z4 Series 2006-2008 Z4 M
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