SKU: 203-5408 | UPC: 672036044121
ARP Toyota 1NZFE 1.5L 4-cylinder DOHC Main Stud Kit 2000-2011 Yaris Echo Scion
The ARP 203-5408 Main Stud Kit upgrades the Toyota 1NZ-FE 1.5L 4-cylinder DOHC engine in models like Yaris Echo and Scion xA xB from 2000 to 2011. Factory main bolts often fail under increased power or boost so these studs provide consistent clamping force to secure main caps and prevent bearing damage. Engine builders rely on this kit for reliable bottom-end strength in tuned street and track applications.
Key Features
- ARP2000 Alloy: Forged steel studs rated at 220,000 PSI tensile strength and 155,000 PSI yield strength for extreme durability over stock fasteners
- Complete Kit Contents: Includes main studs hardened parallel washers and chrome moly 12-point nuts for full replacement
- Thread Design: Precision rolled threads resist fatigue and galling during repeated installations
- Corrosion Protection: Black oxide finish guards against rust in harsh engine environments
- Assembly Ready: Supplied with ARP Ultra-Torque lubricant for accurate torque values
Product Notes
- Confirm engine code 1NZ-FE prior to installation
- Apply ARP Ultra-Torque lube to threads and under nut faces
- Packed in protective retail box for damage-free delivery
Installation Notes
- Professional installation recommended.
- Engine must be fully disassembled to access main caps
- Torque studs to ARP specs in 3 stages using calibrated torque wrench
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2000-2005 | Toyota | Echo | 1.5L 1NZ-FE |
| 2004-2006 | Scion | xA | 1.5L 1NZ-FE |
| 2004-2006 | Scion | xB | 1.5L 1NZ-FE |
| 2006-2011 | Toyota | Yaris | 1.5L 1NZ-FE |
Why Choose ARP?
- Trusted by racers since 1968 in NHRA NASCAR and drag applications
- USA-made with heat-treated forgings exceeding SAE standards
- Backed by limited lifetime warranty on fastener failure
Frequently Asked Questions
- Q: Will this kit fit my 2008 Toyota Yaris 1.5L?
A: Yes it fits all 2006-2011 Toyota Yaris models equipped with the 1NZ-FE 1.5L DOHC engine. Verify your engine code on the block. - Q: What material and strength rating do these studs have?
A: Constructed from proprietary ARP2000 alloy steel with 220,000 PSI ultimate tensile strength and 155,000 PSI yield strength far exceeding OEM bolts. - Q: What is the warranty and reusability?
A: ARP offers a limited lifetime warranty against breakage when installed torqued per instructions. Studs are fully reusable with proper cleaning and lubing.
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Compact box 9 x 7 x 1 inches
- Weight: 0.95 lbs
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