EVO Polaris RZR XP Turbo XR Series 11mm Custom Age 625 Head Stud Kit
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.
XR Series:
Evolution Powersports is proud to introduce the all-new XR Series! All the products in this Xtreme Racing line are race tested and have been designed and developed with extreme power and racing in mind. Many of the products are CNC machined and made from the highest quality materials available. Tested under the most grueling conditions in drag racing, short course & desert racing, these products ensure optimal performance and durability. Many of our new XR Series products are manufactured exclusively for EVP in partnership with some of the best names in the powersports industry.
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
Fitment:
- 2020+ General All Models
- 2024+ Xpedition Northstar & Ultimate Models
- 2020+ Ranger 1000 Crew & Premium Models
- 2024+ Ranger XP 1000 Crew & Northstar Models
- 2020-2023 Ranger Crew 1000 Models
- 2020-2023 Ranger Crew XP 1000 Models
- 2020-2023 Ranger XP 1000 Models
- 2020+ RZR 900 Models
- 2025 RZR Pro S Models
- 2020+ RZR Pro XP Models
- 2022 RZR Trail 900 Premium Model
- 2021+ RZR Trail S 1000 Models
- 2022-2024 RZR Turbo R 2 & 4 Models
- 2020-2021 RZR Turbo S Models
- 2020+ RZR XP 1000 2 & 4 Models
Installation Instructions:
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