ARP 251-6201 Cylinder Head Stud Kit

The ARP 251-6201 cylinder head stud kit provides the ultimate in clamping force and reliability for demanding engine applications. Designed to replace factory head bolts with a superior fastening solution, these studs ensure consistent torque loading and improved gasket sealing performance.

Why Studs Over Bolts?

Cylinder head studs provide more accurate and consistent torque loading compared to traditional head bolts. Because the stud is stationary during installation, the torque applied is used purely for clamping rather than overcoming thread friction and twisting forces. This results in more even pressure distribution across the head gasket and reduced risk of gasket failure.

Key Features:

• Manufactured from premium ARP2000 material for superior tensile strength
• Heat-treated to 220,000 psi for exceptional clamping force
• Threads rolled after heat-treat for up to 10 times longer fatigue life
• Precision CNC-machined to exacting tolerances
• Parallel ground washers included for optimal load distribution
• Complete kit includes studs, nuts, and washers
• Black oxide finish for corrosion resistance

ARP2000 Material Advantages:

ARP2000 is a specialized alloy steel heat-treated to achieve significantly higher strength than standard 8740 chrome moly. With a tensile strength of 220,000 psi, ARP2000 delivers the clamping force needed for high-performance and racing applications while maintaining excellent fatigue resistance and durability.

Installation Note: ARP recommends using their Ultra-Torque fastener assembly lubricant for proper installation torque values. Follow manufacturer torque specifications carefully and use a multi-step torque sequence for optimal results.