• BMW S58 Upgraded Head Stud Kit ARP 625+ Custom Age
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ARP Automotive Racing Products

S54 ARP 625+ Custom Age Head Studs

S54 ARP 625+ Custom Age Head Studs

$899.99 USD
$999.99 USD $899.99 USD
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Turn up the BOOST!  

The ARP 201-4303 head stud kit is specifically designed for the BMW S54 inline 6-cylinder engine and serves as a direct replacement for BMW head bolts (part number 11127831862) commonly found in the E46 M3, E36/7 Z3 M Roadster, Z4 M Coupe and Roadster, and the E46 M3 CSL.

However, the ARP 2000 material may not provide sufficient strength for boosted applications. To address this, we collaborated with ARP to develop a 625+ Custom Age head stud kit, engineered for enthusiasts who want to push higher boost levels without worrying about cylinder head lifting.

This upgraded kit offers several advantages, including increased clamping force and enhanced head gasket sealing, which are critical for preventing head gasket failure. These benefits are especially important for high-performance, stroker, supercharged, or turbocharged engines where elevated cylinder pressures place significant stress on the head gasket and fasteners.

For comparison, the standard ARP 2000 kit (#201-4303) features a tensile strength of 220,000 PSI, while the 625+ Custom Age studs deliver an impressive tensile strength of 280,000 PSI, making them ideal for extreme performance applications.

 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

ARP-S54-625+

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