ARP Main Stud Kit Gen 3 B48

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3.00 LBS
Calculated at Checkout

Obtaining the optimum clamping force is especially critical in small displacement engines employing high compression pistons (like the ones in a Cooper) or power adders like a head or bigger turbo. That's why ARP head studs are popular among leading Sport Compact/Import racers.

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 heat treat, 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).

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) equalizes the "stretch" of the studs, which makes for a more consistent clamping force. This helps prevent blown head gaskets, and assures optimum sealing!

Premium parallel ground washers and assembly lube are also included with each kit.

Note: Currently Special Order

Instructions Download coming soon.

2 Reviews

  • 5
    Great performance bolt

    Posted by Nicholas Johnson on 17th Apr 2023

    Cannot comment to much on the performance of the bolts yet but as far as fitment and torquing they are absolutely phenomenal. With an end goal of 350-400 hp out of this 1.6 these were the only option in my opinion. And one of the most important parts of the build, the glue that hols it all together. Cannot wait to throw some torque at the bad Boys and see how they hold

  • 5
    ARP Head Bolts

    Posted by Alan on 30th Jan 2020

    Most reliable bolts on the market.