Introduction

2G DSM and Evo 8/9 undercut Head Studs

Obtaining the optimum cylinder head-to-block sealing is especially critical in small displacement engines employing high compression pistons or power adders like turbochargers, nitrous oxide and superchargers. 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. Its 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 wont happen with inferior quality head studs.

Features

• 8740 Alloy
• Tensile strength: 200,000 PSI

Recognizing Head Stud Failures

Applications

• 2G DSM and Evo 8/9

What’s in the box?

• ARP head studs
• Parallel ground washers
• 8740 chromoly steel 12pt nuts
• (1) .5 oz. pack of ARP Ultra-Torque fastener assembly lubricant

Warranty

• ARP Warranty