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  3. ARP ARP-HSK-S55-CA

ARP ARP-HSK-S55-CA Head Stud Age Kit N55/S55 625

fits make: Bmw.

Arp-hsk-s55-ca Arp Head Stud Kit Bmw N55/s55 Custom Age 625

( Brand: Arp ), ( Manufacturer Part Number: ARP-HSK-S55-CA ), ( Type: Head Stud Kit ), ( Material: Steel ), ( Country/region Of Manufacture: United States ), ( Performance Part: Yes )

Review ARP Head Stud Kit Bmw N55/s55 Custom Age 625 fits S55

ARP ARP-HSK-S55-CA BMW N55/S55 Head Stud Kit for 625 Applications

The ARP ARP-HSK-S55-CA Head Stud Kit is a precision-engineered solution designed specifically for BMW N55 and S55 engines, catering to the 625 series applications. ARP, a renowned name in the automotive industry, is famous for its high-quality, race-proven fasteners, and this head stud kit is no exception.

This kit features ARP's proprietary 2000-series studs, which are made from forged 12-point, 8740 alloy steel for exceptional strength and reliability. The studs are additionally heat-treated for increased fatigue strength and torque capacity. Each stud is designed to handle the extreme cylinder pressures generated by high-performance engines, minimizing the risk of stud failure and ensuring optimal engine performance.

The ARP ARP-HSK-S55-CA kit includes ARP's exclusive 3/8-24 UNF studs with ARP's unique, self-sealing, 20-degree angled, rolled threads. This design provides superior sealing against oil and coolant, preventing potential leakage and enhancing overall engine efficiency.

The studs are also equipped with ARP's trademark, high-tensile, 12-point, domed, stainless steel nuts. These nuts are designed to provide maximum clamping load and evenly distribute the clamping force across the head gasket, ensuring a secure and reliable seal.

Installation of the ARP ARP-HSK-S55-CA Head Stud Kit is straightforward, thanks to the inclusion of ARP's exclusive, high-temperature, copper-core, composite washers. These washers provide a reliable and effective barrier against cylinder pressure, preventing potential stud failure due to excessive heat.

In summary, the ARP ARP-HSK-S55-CA Head Stud Kit is a high-quality, race-proven solution for BMW N55 and S55 engines, offering enhanced strength, reliability, and performance for your 625 series application. Trust ARP for your engine's fastener needs and experience the difference of precision engineering and race-proven technology.

Pros and Cons of Purchasing ARP ARP-HSK-S55-CA Head Stud Kit for BMW N55/S55 (625ci)

Pros:

1. Enhanced Engine Durability: ARP head stud kits are known for their increased clamping force, reducing the possibility of head gasket failure. This can significantly extend the lifespan of your engine.

2. Improved Performance: The high-strength fasteners can handle increased boost pressure and horsepower, which is common in tuned or modified engines.

3. Peace of Mind: ARP is a reputable brand in the performance aftermarket, ensuring quality and reliability.

4. Suitability: This specific kit is designed for the BMW N55 and S55 engines, making it a direct fit for your 625ci vehicle.

Cons:

1. Cost: ARP head stud kits are more expensive than OEM (Original Equipment Manufacturer) options. However, the cost must be weighed against the potential benefits, such as increased engine life and performance.

2. Installation Complexity: Installing a head stud kit requires engine disassembly, which can be a challenging and time-consuming process, even for experienced mechanics.

3. Potential for Damage: If not installed correctly, there is a risk of damaging the engine or other components. It's crucial to follow proper installation procedures.

4. Overkill for Stock Engines: If your engine is stock and not subjected to high boost or power levels, the benefits of a head stud kit may not outweigh the costs and complexity of installation.

Conclusion:

The ARP ARP-HSK-S55-CA Head Stud Kit for BMW N55/S55 engines offers enhanced durability and potential performance gains, making it an attractive option for those with tuned or modified engines. However, for stock engines or those unwilling to undertake a complex installation, the cost and potential risks may outweigh the benefits.

Recommendation:

If you have a tuned or modified engine, and you're comfortable with the installation process, the ARP ARP-HSK-S55-CA Head Stud Kit could be a worthwhile investment. If your engine is stock, you may want to consider other options that better suit your needs and budget. It's always a good idea to consult with a professional mechanic or BMW specialist before making a decision.

Details:

Unlike those kits, our kit was specifically designed for the BMW N55/S55 engines. To ensure proper thread engagement and accurate torque readings, clean ALL threads in the block. This means allowing the engine to warm up its normal operating temperature, remain at temperature for several minutes ensure each component is uniformly heated, then turned off and cooled completely ambient. This is due to higher friction on the studs as well inconsistencies in clamping force of fasteners when motor oil or other low quality lubricants are used.

Chase if necessary with ARP Thread Chaser. Its an ideal choice for individuals who want to push the limits of their N55/S55 builds. Lubricate the stud threads, nuts and washers with ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT. Then install the washers and nuts onto studs tighten them hand tight.

Clean and inspect all hardware prior to installation. If the cylinder head studs protrude into a water jacket, lubricate block threads of with ARP THREAD SEALER. Look for obvious defects or shipping damages, plus proper fit, length and dimension. This kit comes with 14x 11mm Studs, Washers, and Nuts offering increased clamping force enhanced head gasket sealing, which can prevent failure.

ARP recommends using the ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT that is provided with each kit as opposed to motor oil. Install the cylinder head and check for binding or misalignment. This kit is engineered to replace BMW part # and compatible with N55B30 engines found in a range of model's, including the F07 535i GT, F10/F11 535i, F06/F12/F13 640i, F25 X3 xDrive35i, F26 X4 E84 X1 xDrive35i. Screw studs into the block HAND TIGHT ONLY.

part #: arp-hsk-s55-ca price

  • $1149.99

specifications pistonrinro:

  • for makes: Bmw
  • brand: Arp
  • mpn: Arp-hsk-s55-ca
  • type: Head Stud Kit
  • material: Steel
  • country/region of manufacture: United States
  • performance part: Yes

shipping pistonrinro:

  • type: Calculated
  • transit: 5-10 Days
  • carrier: UPS
  • cost: $15.48
  • service: UPS Ground
  • class: Standard

seller pistonrinro:

  • rating: 100.0%
  • # reviews: 37
  • city: Philadelphia, Pennsylvania

offer pistonrinro:

  • quantity: 5
  • started: April 19, 2025
  • sold: 0
  • availability: In Stock
  • options: Ship-to-home

payments pistonrinro:

  • wallet: Apple-pay
  • credit card: Visa
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general pistonrinro:

  • Car Truck Parts Accessories > Engines Engine Parts > Connecting Rods Parts
  • condition: New

returns pistonrinro:

  • policy: No Returns
for makes: bmw, type: head stud kit, country/region of manufacture: united states, performance part: yes,
category: auto parts > car truck parts accessories > engines engine parts > connecting rods parts, material: steel, sku: 8606039418234502,
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1 offer $1149.99 USD
  • New. Offer #1 priced at $1149.99 + $16.49 shipping estimate = $1166.48* total. N55 engines, it is a MUST to drill and tap the four outer 9mm holes in the engine block to increase their size to 11mm holes.+$16.49 shipping

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