ARP Pro Series head studs are a proven choice for all-out competition engine builds, commonly relied on by professional engine builders where consistent clamping and precise fit matter.

Material & Manufacturing

• Made from premium grade 8740 alloy.
• Heat-treated to 200,000 psi with each stud held vertically in special racks to promote complete heat penetration.
• Centerless ground after heat treatment for near-perfect concentricity.
• Multiple light centerless-grinding cuts (about ten) for exceptional straightness.
• Threads are rolled in bar stock form, typically before heat-treat.

Fit & Alignment

Built to tight tolerances so gaskets and cylinder heads glide into position and align cleanly during assembly.