ARP 250-4201 Cylinder Head Stud Kit 12-Point ARP2000 Pro Series

The ARP 250-4201 Pro Series head stud kit delivers professional-grade fastening performance for high-performance and racing engines. Engineered to exacting tolerances and manufactured from premium materials, this 12-point head stud kit represents the gold standard in cylinder head retention.

Premium ARP2000 Alloy Construction:

Each stud is precision-machined from premium grade 8740 chrome moly steel alloy, rated at 200,000 psi tensile strength—significantly superior to aircraft quality fasteners. ARP's proprietary vertical rack heat-treating process ensures complete and uniform heat penetration throughout each stud, delivering consistent material properties and exceptional strength.

Precision Manufacturing Process:

• Centerless ground after heat-treat for near-perfect concentricity and straightness
• Thread rolled after heat-treat for 10x better fatigue strength compared to pre-heat-treat threading
• Cold-forged construction ensures molecular integrity
• Exacting tolerances allow cylinder heads and gaskets to align effortlessly during assembly
• Specially undercut shorter studs equalize stretch for consistent clamping force

Superior Performance Benefits:

• 12-point head design with reduced wrenching profile for easy access
• Wide-area flanged head eliminates need for valve train removal during retorquing
• More accurate and consistent torque loading compared to bolts
• Studs stretch only on vertical axis, avoiding the twisting forces that affect bolts
• Helps prevent head gasket failures through optimized clamping force
• Easier engine assembly with assured proper alignment

Kit Includes:

• Complete set of ARP2000 Pro Series head studs
• Hardened parallel-ground washers for even load distribution
• Premium assembly lubricant

Each stud is stamped with the ARP logo as your assurance of quality. Trusted by professional engine builders across all forms of motorsports, ARP Pro Series head studs meet the company's zero-defect, zero-failure quality standard. Perfect for competition powerplants and serious high-performance street engines where maximum reliability is essential.