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SKU: 151-5405 | UPC: 672036024123
ARP Main Stud Kit for Ford 2.3L Duratec (2003 & later)
ARP main stud kit 151-5405 upgrades Ford 2.3L Duratec engines from 2003 onward found in Focus Ranger Fusion Milan and compatible Mazda models. These studs prevent main cap walk and fretting while safeguarding engine block threads for reliable high-horsepower builds. Kits deliver 8740 chrome moly construction with 190000 PSI strength and rolled J-form threads for durability under extreme loads.
Key Features
- Eliminates Cap Walk: Locks main caps securely to maintain precise bearing alignment during high-rpm operation
- Prevents Fretting: Reduces wear between caps and block for long-term engine stability
- Protects Block Threads: Stud design distributes clamping force evenly avoiding thread damage
- 8740 Chrome Moly Steel: Heat-treated in-house to 190000 PSI tensile strength with black oxide finish
- Precision J-Form Threads: Rolled after heat-treat creating threads 2000% stronger than off-the-shelf fasteners
Product Notes
- Complete kit includes hardened parallel-ground washers and 12-point nuts
- Provisions for windage tray mounting with standoff studs and serrated lock nuts on applicable setups
- Made in USA for consistent quality control
Installation Notes
- Professional installation recommended.
- Torque to ARP specifications using ARP moly lube for accurate clamping loads
- Compatible with OEM main caps and girdles no modifications required
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2001-2011 | Ford | Ranger | XL XLT Edge Sport 2.3L L4 |
| 2003-2007 | Ford | Focus | ZX3 ZX4 ZX5 ST SE S 2.3L L4 |
| 2006-2009 | Ford | Fusion | S SE I4 2.3L |
| 2006-2008 | Mercury | Milan | I4 2.3L |
| 2004-2009 | Mazda | 3 | i 2.3L L4 |
| 2007-2009 | Mazda | Speed 3 | 2.3L L4 |
Why Choose ARP?
- Trusted by racers for decades in NHRA NASCAR and endurance events
- In-house heat treatment ensures every batch meets 190000 PSI rating
- Rolled threads and J-form design deliver clamp load retention under boost and nitrous
Frequently Asked Questions
-
Q: Which Ford 2.3L Duratec engines does ARP 151-5405 fit?
A: Fits 2003+ Ford 2.3L Duratec in Ranger Focus Fusion Milan plus Mazda 3 and Speed 3 2.3L variants confirm fitment with ARP application guide -
Q: What material and finish are used?
A: 8740 chrome moly steel black oxide finish heat-treated to 190000 PSI with rolled J-form threads after treatment -
Q: What warranty applies and installation tips?
A: ARP limited lifetime warranty for street and track use apply ARP lube torque in sequence professional install advised for best results
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: Protective cardboard box 8.5 x 7 x 1.75 inches
- Weight: 2.1 lbs
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