ARP Head Stud Kit – Nissan RB20 / RB20DET / RB25 / RB25DET | 2000cc Series | Nissan Skyline R32 / R33 / R34 | Superior Clamping Force | Re-Usable

The ARP Head Stud Kit for the Nissan RB20, RB20DET, RB25, and RB25DET is a complete head stud kit engineered to replace the factory head bolts with ARP's 2000cc series studs — providing superior clamping force, improved head gasket sealing, and the ability to re-torque and re-use the studs across multiple engine builds. ARP head studs are the standard head fastener upgrade for any boosted or high-performance RB engine build — a critical component for maintaining head gasket integrity under the elevated cylinder pressures of a modified RB20DET or RB25DET. ARP (Automotive Racing Products) is the most respected fastener manufacturer in the performance and motorsport market — an American manufacturer whose head studs, rod bolts, and main studs are the reference standard for performance engine building worldwide.

Key Features:

• ARP 2000cc series material — ARP's 2000cc series alloy steel — rated to 220,000 PSI tensile strength — significantly stronger than the factory head bolt material and stronger than standard ARP 8740 chrome moly studs
• Superior clamping force — studs provide more consistent and higher clamping force than bolts — studs load in pure tension without the torsional stress of a rotating bolt, resulting in more accurate and consistent clamping across all head fastener locations
• Re-usable — ARP head studs can be re-torqued and re-used across multiple engine builds — unlike factory head bolts which are torque-to-yield (TTY) and must be replaced after each use
• Complete kit — a complete head stud kit for the RB20/RB25 — all studs, nuts, and washers required for a complete installation
• Correct for RB20, RB20DET, RB25, RB25DET — one kit covers the naturally aspirated RB20, turbocharged RB20DET, naturally aspirated RB25, and turbocharged RB25DET variants
• ARP quality — manufactured by ARP, the most respected fastener manufacturer in the performance and motorsport market

Head Studs vs. Head Bolts — Why It Matters for the RB:

The factory Nissan RB head bolts are torque-to-yield (TTY) fasteners — they are designed to stretch slightly during installation to achieve the correct clamping load. TTY bolts must be replaced after each use because the stretching permanently deforms the bolt. More critically, TTY bolts apply clamping force through a combination of tension and torsion (the rotational force of tightening) — the torsional component introduces variability in the actual clamping force achieved at each fastener location. ARP studs are installed finger-tight into the block and then the nut is torqued onto the stud — the stud loads in pure tension without torsional stress, resulting in more accurate and consistent clamping force at every fastener location. For boosted RB builds where head gasket integrity is critical, the consistent, high clamping force of ARP studs is the correct choice.

RB20 / RB25 — Platform Context:

The Nissan RB20 and RB25 are inline-six engines used in the Nissan Skyline R32, R33, and R34 — among the most celebrated and widely modified Japanese performance engines in the world. The RB20DET (turbocharged 2.0L) and RB25DET (turbocharged 2.5L) are the performance variants — engines with significant power potential that are commonly modified with larger turbos, upgraded fuel systems, and engine management upgrades that substantially increase cylinder pressure beyond the factory specification. At elevated boost levels, the factory head bolts are a known weak point — ARP head studs are the standard upgrade for any serious RB build targeting power levels beyond the factory specification.

Specifications:

• Brand: ARP
• Part Number: ARP202-4301
• Barcode: 202-4301
• Material: ARP 2000cc series alloy steel
• Tensile Strength: 220,000 PSI
• Application: Nissan RB20 / RB20DET / RB25 / RB25DET
• Weight: 3.6 lbs (kit weight)

Fitment Information:

• Nissan Skyline R32 — RB20DET / RB25DET
• Nissan Skyline R33 — RB25DET / RB25DET NEO
• Nissan Skyline R34 — RB25DET / RB25DET NEO / RB26DETT (verify)
• RB20 (naturally aspirated) and RB20DET (turbocharged) — 2.0L
• RB25 (naturally aspirated) and RB25DET (turbocharged) — 2.5L
• Note: Verify your specific RB engine variant and generation before ordering — confirm that ARP202-4301 is the correct head stud kit for your specific RB20 or RB25 engine. The RB26DETT (GT-R) uses a different head stud kit — verify before ordering. Professional engine builder installation strongly recommended.

What's Included:

• ARP 2000cc series head studs — complete set for RB20/RB25 (quantity per engine specification)
• ARP nuts
• ARP washers
• ARP assembly lubricant
• Refer to ARP's product documentation for complete kit contents and torque specifications

Installation Notes:

• Professional engine builder installation strongly recommended — head stud installation requires correct stud installation torque (finger-tight plus a specific installation torque), correct ARP lubricant application, and correct final torque to ARP's specification
• Use ARP's supplied assembly lubricant on the stud threads and under the nut — do not use engine oil or other lubricants — the torque specification is calibrated for ARP's specific lubricant
• Clean and chase all head stud holes in the block before installation — debris or damaged threads in the block will affect clamping force accuracy
• Install studs finger-tight into the block — do not over-torque the stud into the block — the stud should be snug but not preloaded
• Torque the nuts in the correct sequence and to ARP's specified torque value — refer to ARP's torque specification sheet included with the kit
• A new head gasket is required whenever the cylinder head is removed — do not re-use the factory or existing head gasket

Why ARP?

ARP (Automotive Racing Products) is the most respected fastener manufacturer in the performance and motorsport market — an American manufacturer whose head studs, rod bolts, and main studs are the reference standard for performance engine building worldwide. ARP's 2000cc series material provides 220,000 PSI tensile strength — the correct specification for high-boost RB builds where maximum clamping force and fastener reliability are critical. For RB20 and RB25 engine builders who want the most trusted head stud kit available for the RB platform, ARP202-4301 is the correct choice.

Perfect For:

• Nissan RB20DET and RB25DET engine builds running elevated boost levels where ARP head studs are required to maintain head gasket integrity under the increased cylinder pressures of a modified RB engine
• RB engine rebuilds where the factory TTY head bolts are being replaced with re-usable ARP 2000cc series studs for improved clamping consistency and the ability to re-torque across multiple builds
• Skyline R32, R33, and R34 engine builders who want ARP's proven 2000cc series head stud quality for a reliable, high-performance head fastener upgrade on the RB20 or RB25 platform

Note: Verify RB20/RB25 engine variant before ordering — RB26DETT uses a different kit. Use ARP assembly lubricant only — do not substitute. Clean and chase all stud holes before installation. New head gasket required. Torque to ARP's specification in correct sequence. Professional engine builder installation strongly recommended.