ARP 201-4301 Head Stud Kit - 8740 Alloy Cylinder Head Studs

The ARP 201-4301 head stud kit is designed to deliver optimum cylinder head-to-block sealing, which is especially critical in small displacement engines running high compression pistons or power adders such as turbochargers, nitrous oxide and superchargers. For this reason, ARP head studs are popular among Sport Compact and import racers. This kit is listed as the S Model stud kit.

Key Features:

• Premium 8740 alloy: ARP describes this material as far superior to "aircraft" quality.
• Heat-treated to 200,000 psi: each stud is precisely heat-treated for strength.
• Centerless ground: after heat treatment, each stud is centerless ground with about ten very slight cuts for exceptional concentricity and straightness.
• Thread rolled after heat treatment: ARP states this gives about 1000% better fatigue strength than studs threaded before heat treatment.
• Precise tolerances: gaskets and cylinder heads are described as gliding into position and aligning properly.
• Undercut studs: ARP undercuts the shorter studs on certain engines to more equalize stretch between studs, giving a more consistent clamping force that compensates for head gasket compression. This helps prevent blown head gaskets and supports optimum sealing.

A solid choice for builders who want a reliable, consistent clamping solution for a high-output small-displacement engine.