HKS 22999-AN008 Head Studs Pro for 1989-2002 Nissan Skyline GT-R RB26DETT

Vehicle Fitment

• 1989-1994 Nissan Skyline GT-R (BNR32; RB26DETT Twin-Turbo I6; AWD; JDM; engine)
• 1995-1998 Nissan Skyline GT-R (BCNR33; RB26DETT Twin-Turbo I6; AWD; JDM; engine)
• 1999-2002 Nissan Skyline GT-R (BNR34; RB26DETT Twin-Turbo I6; AWD; JDM; engine)

Fitment Notes

• Engine head-stud kit specifically developed for the Nissan RB26DETT engine.
• HKS documentation identifies the BNR32, BCNR33, and BNR34 Skyline GT-R platforms as the supported applications.
• HKS states that the kit was developed on a JDM vehicle and has not been tested on vehicles for other markets.
• Professional installation is required according to the HKS installation manual.
• This is an engine component rather than a vehicle-specific suspension or brake component.

Features

• HKS Head Studs Pro for RB26DETT engines
• Designed for high-output RB26DETT builds
• Uses ARP Custom Age 625+ high-strength material
• Approximately 1.3 times the tensile strength of ARP2000 material according to HKS
• Bottomed stud design increases effective block-side thread engagement
• Bottomed design helps distribute stress through the block threads
• Designed to reduce stress concentration around block deck threads
• Supports improved cylinder-head sealing under high combustion pressure
• Developed with high-output and hard-tuned RB26DETT engines in mind
• Evaluated in drag-racing testing at outputs exceeding 1200 PS according to HKS
• Compatible with HKS head-gasket applications

Specifications

• Brand: HKS
• Part Number: 22999-AN008
• Product Type: Engine Head Stud Kit
• Engine: Nissan RB26DETT
• Material: ARP Custom Age 625+
• Application: Nissan Skyline GT-R
• Platform Codes: BNR32, BCNR33, BNR34
• Drive Configuration: AWD
• Market Application: JDM
• Position: Engine Cylinder Head

Included Components

• 1x HKS Head Stud Kit Pro RB26DETT

Product Description

HKS 22999-AN008 Head Studs Pro is a reinforced cylinder-head stud kit developed specifically for Nissan RB26DETT engines used in the BNR32, BCNR33, and BNR34 Skyline GT-R. HKS designed the kit for high-output engines where increased combustion pressure places greater demands on the cylinder-head fastening system.

The studs use ARP Custom Age 625+ material, which HKS identifies as having approximately 1.3 times the tensile strength of ARP2000 material. The bottomed-stud design increases effective thread engagement on the engine-block side and distributes stress, helping reduce the risk of cracking around the deck-side threaded holes.

HKS documentation covers 1989-1994 BNR32, 1995-1998 BCNR33, and 1999-2002 BNR34 Skyline GT-R models, all equipped with the RB26DETT engine. HKS specifically notes that the product was developed on a JDM vehicle and has not been tested on vehicles for other markets. Installation should be performed by a qualified professional in accordance with the HKS installation documentation.