• ARP Head Stud Kit for BMW and MINI B38 Engines
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ARP Automotive Racing Products

BMW B48 ARP Head Stud Kit

BMW B48 ARP Head Stud Kit

$299.99 USD
$299.99 USD $299.99 USD
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Type

This ARP2000 Head Stud Kit is designed for the turbocharged inline 4-cylinder B48 engines found in varias BMW chassis and Mini Engines. As you increase the power output of your engine beyond its factory specifications, the head and block may start to separate, causing factory bolts to stretch and fail. ARP Head Studs are stronger than factory bolts, ensuring your race engine stays together even under extreme conditions. 

The Custom Age 625+ option is made from ARP's 625+ material that has a tensile strength of 260 ksi, substantially higher than the 190 ksi of the ARP 2000 head stud. It's an ideal choice for individuals who want to push the limits of their B48 builds and require a stronger head stud.

Our Oversized Kit option utilizes ARP's proprietary Custom Age 625+ material option combined with specialized insert washers for ultra-high boost applications. Please note that this kit requires that the cylinder head be clearanced and the engine block to be machined for the installation of insert washers.

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.

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.

PRELOAD (TORQUE) RECOMMENDATIONS

7. Following the manufacturers recommended torque sequence tighten the nuts steps 1-3

ARP2000
Step 1: Tighten to 30 ft-lbs.
Step 2: Tighten to 60 ft-lbs.
Step 3: Tighten to 90 ft-lbs.

Custom Age 625+
Step 1: Tighten to 30 ft-lbs.
Step 2: Tighten to 60 ft-lbs.
Step 3: Tighten to 110 ft-lbs.

with ARP Ultra-Torque fastener assembly lubricant

Bolt Torque Sequence

7 3 1 5
 9
10 6 2 4 8


BMW B48 Applications:

1 Series

2016-2019    F20    120i / 125i
2019-2023     F40     118i / 120i / 128ti / 135i / M135i
2024-Present     F70     120 / M135i 

2 Series

2014-2021     F22/F23     218i / 220i / 230i
2014-2017     F45     220 / 225i
2021-Present     G42     218i / 220i / 230i
2021-Present     U06     223i
2020-2024     F44     218i / 220i / 228i / M235i
2025-Present     F74     M235

3 Series

2015-2019     F30/F31/F34     320i / 330i / 330e
2018-Present     G20/G21     318i / 320i / 330i / 330e

4 Series

2016-2019    F32/F33/F36    420i / 430i
2020-Present     G22/G23/G26     420i / 430i / 430e

5 Series

2017-Present     G30/G31     520i / 530i / 530e

6 Series

2017-Present     G32     630i

7 Series

2015-2022     G11/G12     730i / 730Li / 740e / 740Le

X1 Series

2015-2022     F48     sDrive18i / sDrive20i / xDrive20i / 25i / xDrive25i / 28i
2022-Present     U11     sDrive18i / xDrive20i / xDrive28i / M35i

X2 Series

2018-2023     F39     sDrive18i / sDrive20i / xDrive20i / 25i / xDrive25i / 28i / M35i
2023-Present     U10     xDrive28i / M35i

X3 Series

2017-2024     G01     sDrive20i / xDrive20i / xDrive30i / xDrive30e
2025-Present     G45     xDrive20e / xDrive30e

X4 Series

2018-Present     G02     xDrive20i / xDrive30i

X5 Series

2018-Present     G05     xDrive25i / sDrive25i

Z Series

2018-Present     G29     Z4 sDrive20i / sDrive30i

Toyota B48 Applications:

A90 / A91 Supra

2019-Present     J29/DB82/DB22 Supra
2020-Present     GR Supra 2.0  

MINI B48 Applications:

MINI Hatch [F55/F56/F57]

2014-Present     Cooper S
2015-Present     John Cooper Works (JCW)

MINI Clubman [F54]

2015-Present     Cooper S
2016-Present     John Cooper Works (JCW)

MINI Convertible [F57]

2016-Present     Cooper S
2016-Present     John Cooper Works (JCW) 

ARP-HSK-B48-S

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