• 4JJ1 ARP Head Studs - Common Rail Cowboys
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Diesel Performance Parts

4JJ1 ARP Head Studs

4JJ1 ARP Head Studs

$1,177.00 NZD
$1,177.00 NZD
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4JJ1 ARP Head Studs (ARP2000)

 

✅ Genuine ARP ⚙️ ARP2000 Alloy 🚚 Free Express AU

 

Heavy-duty ARP2000 head studs to suit Isuzu 4JJ1 and 4JX1TC engines. A must-have for tuned, boosted or hard-working engines needing maximum clamping force and repeatable preload — far superior to factory torque-to-yield bolts.

🧩 Overview

ARP2000 alloy provides significantly higher tensile strength and far more consistent torque retention than OE bolts. Perfect for towing, performance builds and high-boost 4JJ1 setups.

  • Heat-treated ARP2000 alloy steel
  • Accurate, repeatable clamping force
  • Supports high-boost and big-power applications
  • Less risk of head gasket movement vs OE bolts

Supplier data shows ~15–30% higher clamping load depending on preload.

📦 What’s Included
  • 18 × ARP2000 head studs
  • 18 × parallel-ground hardened washers
  • 18 × 12-point nuts
  • ARP Ultra-Torque lubricant
🔧 Suits / Compatibility
  • Isuzu 4JJ1 — D-MAX, MU-X, RA7 Rodeo, Colorado RC
  • Isuzu 4JX1TC applications

If unsure, message us with your VIN/engine code and we’ll confirm.

✨ Why Choose ARP Studs?
  • Higher clamping force vs OE bolts
  • Better load distribution for gasket sealing
  • Reusable if within spec
  • Essential for tuned/boosted engines
🛠 Install Notes
  • Chase block threads fully with a bottoming tap
  • Under-cam stud issue: 8 studs must be shortened (hex-end)
  • Washer recess depth: machine head recesses an extra ~3.5 mm for those locations
  • Even with machined recesses, the 8 studs still require shortening
  • Use ARP Ultra-Torque on nut threads & under-washer surfaces only
  • Follow ARP torque sequence and multi-step tightening

Professional installation recommended.

🔩 Torque Procedure (Guide)
  • Install studs finger-tight into block
  • Fit washers/nuts with Ultra-Torque applied
  • Torque in stages following OE tightening pattern
  • Final torque based on ARP chart for Ultra-Torque

Use the supplied DPP instruction sheet.

💳 Payment & 🚚 Shipping
  • Afterpay, Humm, Klarna & Zip available
  • Free Express Shipping Australia-Wide

❓ FAQs

Do I have to machine the head?
For the under-cam locations, yes — machine washer recesses ~3.5 mm AND shorten 8 studs. This ensures correct clearances are observed.
Can I reuse ARP studs?
Yes, if they remain within spec. Clean, inspect and follow ARP guidelines.
What torque should I use?
Use the torque value from the instruction sheet provided.
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