EVP XR Series 11mm Custom Age 625 Head Stud Kit for Polaris RZR XP Turbo/S, Pro XP, & Turbo R
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Prevent premature head gasket failure on bigger power engines! The Evolution Powersports XR Series CA-625 11mm direct replacement Polaris XPT head studs are for those wanting the ultimate strength for high horsepower engine builds. Manufactured by ARP using their proprietary Custom Age alloy, the XR series head stud is the strongest head stud available anywhere. Custom Age 625 alloy typically equals or exceeds the clamping force of ~2mm larger 8470 Chromoly fastener in a smaller package. For the XP Turbo/Pro XP engine where there is not much material in the block to enlarge the stud significantly, these 11mm Custom Age 625 studs are the ideal solution. These head studs will keep your engines head sealed for the boost pressure required to produce 300-400 horsepower.
Why the EVP XR Series CA-625 studs are superior to other studs on the market:
✓ Fits
- 2020+ General All Models2024+ Xpedition Northstar & Ultimate Models2020+ Ranger 1000 Crew & Premium Models2024+ Ranger XP 1000 Crew & Northstar Models2020-2023 Ranger Crew 1000 Models2020-2023 Ranger Crew XP 1000 Models2020-2023 Ranger XP 1000 Models2020+ RZR 900 Models2025 RZR Pro S Models2020+ RZR Pro XP Models2022 RZR Trail 900 Premium Model2021+ RZR Trail S 1000 Models2022-2024 RZR Turbo R 2 & 4 Models2020-2021 RZR Turbo S Models2020+ RZR XP 1000 2 & 4 Models
✓ Features
- The 11mm (stock) OD is the ideal size to maximize clamping force without sacrificing block integrity
- Made from ARP CA-625 alloy - This super-alloy has superior fatigue cycle life, tensile strength and toughness and is rated to 260,000 psi tensile strength. For comparison, a typical 8470 chromoly stud is roughly 170,000 psi.
- Machined ball end allows the stud to bottom out in the case without losing any thread engagement.
- Includes head studs, nuts, and washers for the ultimate direct replacement head stud kit
✓ Specs
- Brand: Evolution Powersports (EVP)
- Part #: 3591020002
- Condition: New
✓ Instructions
📦 Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.
Need something by a specific date? Call us at 541-668-7503 before ordering and we will check stock and ETA on that exact part. We can often point you to an in-stock alternative from another distributor.
Questions? Contact us, we respond within 24 hours.
