ARP Head Stud Kit for the BMC A-Series (11-stud)—trusted by professional engine builders for strength, accuracy, and long-term sealing.

Manufactured from premium 8740 chrome moly steel and heat-treated to around 200,000 psi, these studs are designed for high-performance and competition engines where consistent clamp load matters most. Each stud is centerless ground for exceptional straightness and concentricity, helping the head and gasket locate cleanly and accurately during assembly.

Unlike many alternatives, ARP studs are thread-rolled after heat-treat, delivering dramatically improved fatigue strength and durability. Studs also provide more accurate torque loading than bolts, because the stud remains “relaxed” in the block while the nut applies clamping force—resulting in more consistent, repeatable torque readings and improved head gasket sealing.

Key benefits:

Premium 8740 chrome moly construction

Heat-treated for outstanding tensile strength

Precision manufacturing for accurate alignment

Improved fatigue strength with post-heat-treat thread rolling

Stud design helps deliver consistent clamping force and supports reliable sealing