ARP Main Stud Kit
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ARP Main Stud Kit - Ford 2.3 EcoBoost - Focus RS (LZ) / Mustang (S550)
This ARP main stud kit suits the 2.3 EcoBoost engine in the Ford Focus RS LZ / Mustang EcoBoost. It replaces the factory main cap bolts with studs and nuts, keeping the main caps clamped and located when rpm, boost and cylinder pressure go up.
Studs load the block threads more evenly than bolts and make it easier to line up the caps during assembly.
See the Vehicle Fitment tab for the full list of vehicles.
Note: Installation by a professional is recommended.
Features
- Made in the USA by ARP
Pairs Well With
Shop more: ARP
Need help choosing parts? Contact our team at sales@chicaneaustralia.com.au.
Vehicle Compatibility
| Make | Model | Chassis | Years | Engine / Notes |
|---|---|---|---|---|
| Ford | Focus RS | LZ | 2016–2018 | 2.3 EcoBoost |
| Ford | Mustang EcoBoost | S550 | 2015–2023 | 2.3 EcoBoost |
Technical Specifications
| Spec | Value |
|---|---|
| Brand | ARP |
| Product | Main Stud Kit |
| Engine | 2.3 EcoBoost |
| Part number(s) | 151-5407 |
Contents
1 x ARP main stud kit – studs, nuts and washers for one engine
No instructions available for this product.

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