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    Home / ARP - HEAD STUD KITS
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    You should know that ARP® uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality. Then, each stud is precisely heat-treated to 200,000 psi. Following heattreat, each stud is centerless ground to make it as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. It's important to note that lesser quality studs are not even centerless ground—the material is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine). Because ARP® studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned—something that won't happen with inferior quality head studs.

    ARP® studs are thread rolled after heat-treat, which gives them about 1000% (that's ten times) better fatigue strength than those studs that are threaded prior to heat-treat.

    You will also note that ARP® offers specially undercut studs for several engines. This procedure (done only to the shorter studs) more equalizes the "stretch" of both studs, which makes for a more consistent clamping force—one that compensates for head gasket compression when the head is installed. This helps prevent blown head gaskets, and assures optimum sealing!


    • ARP custom aged 625+ head studs.Centerless ground, heat treated prior, nominally rated at 270,000psi
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      ARP custom aged 625+ head studs.Centerless ground, heat treated prior, nominally rated at 270,000psi

      Compatibility

      Mitsubishi - Evolution 7 (CT9A)
      Mitsubishi - Evolution 8 (CT9A)
      Mitsubishi - Evolution 9 (CT9A)

      $829.00
    • ARP head stud kit. 12 point nuts and ground washers are included.
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      ARP head stud kit. 12 point nuts and ground washers are included.

      Compatibility

      Mitsubishi - Evolution 10 (CZ4A)

      $379.00
    • ARP head stud kit. 12 point nuts and ground washers are included.
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      ARP head stud kit. 12 point nuts and ground washers are included.

      Compatibility

      Mitsubishi - Evolution 4 (CN9A)
      Mitsubishi - Evolution 5 (CP9A)
      Mitsubishi - Evolution 6 (CP9A)
      Mitsubishi - Evolution 7 (CT9A)
      Mitsubishi - Evolution 8 (CT9A)
      Mitsubishi - Evolution 9 (CT9A)

      $399.00

    Address: 18 Zeta Crescent, O'connor,
    Perth W.A. 6163

    Phone: (08) 9314 3444

    ABN: 70 7446 24791

    Email: sales@visionr.com.au

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