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XP Turbo/S XR Series EVP Head Stud Kit

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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. Designed by by Brian Crower and ARP and 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:

  • 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

1 x XP Turbo/S XR Series EVP Head Stud Kit
$169.00
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$169.00
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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.

    This product is exempt from the emission standards and related requirements of 40 C.F.R. § 1051 as provided by 40 C.F.R. § 1051.620, and California law [e.g., vehicle code§§ 27156 and 38391]. This product is sold only for use in connection with EPA -certified, purpose-built, nonroad vehicles used solely for closed course, nonroad competition/racing and not used for any recreational purpose or on public highways or right of ways maintained by and open to the public. This product is sold only in connection with machines that do not fall under state and/or federal noise or emission standards/regulations. Purchasers who/that purchase this product represent and warrant that the product is purchased only in connection with EPA -certified, emission-regulations-exempt and noise-regulations-exempt competition/racing vehicles as interpreted under applicable state and/or federal law. Questions: Call Evolution Powersports at (715) 247-3862.

    testimonials

    My car is absolutely insane. LOVE it. Thank you for everything. Zero issues and even in 95 degree ambient it's not over heating dining or anything. This power dining is 100% perfect. Car is a beast. You guys Rock! - Dynomite Turbo Kit

    Ernie

    Evolution Powersports has a reputation of the utmost quality and attention to detail on every product they design. From within the industry and outside, I have heard nothing but great things about this company and my experience has been the same. If you are looking to make more reliable power this company can get you there. Both customer service and product design are top notch and they stand behind their work!

    Blake S

    Don’t spend much of your money here unless you want gobs and gobs of reliable power

    Collision Vision

    I wouldn’t go with another company if you payed me

    Ryan L

    If you truly want to build your project with the best possible parts available, buy EVO. They not only build with the best materials they test and test to make sure you are getting the performance gains they say you will but that the mods will be safe and keep the reliability of the machine as high as possible. Thanks again to both Jim and Todd. Keep it up guys!

    John K

    Great customer service!
    I have had such a great experience with EVO over the course of a year, I wouldn’t even try going anywhere else. Prices are fair and the performance you receive is unreal!!

    Dave B

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