ARP 202-4309 Head Stud Kit Pro Series - ARP2000 12-Point

The ARP 202-4309 is a premium head stud kit from ARP's Pro Series line, featuring ARP2000 material rated at 200,000 psi tensile strength and 12-point head design. These studs are the choice of professional engine builders who demand absolute reliability in high-performance and racing applications.

ARP2000 Pro Series Construction:

• Premium 8740 chrome moly steel alloy rated at 200,000 psi
• Cold-forged to ensure molecular integrity throughout the fastener
• Vertical rack heat-treatment for complete and consistent heat penetration
• Centerless ground after heat-treat for exceptional straightness and concentricity
• Thread rolled after heat-treatment for 10x better fatigue strength
• 12-point head with wide area flange for easy installation and retorquing

Performance Advantages:

• Superior clamping force compared to standard head bolts
• More accurate and consistent torque loading without torsional stress
• Easier engine assembly with perfect cylinder head and gasket alignment
• Undercut short studs (where applicable) equalize stretch for more consistent clamping
• Eliminates need for valve train removal during head retorquing
• Helps prevent head gasket failures through optimized clamping force

Each kit includes hardened, parallel-ground washers to ensure even load distribution and accurate torque readings. ARP studs are manufactured to exacting tolerances, allowing cylinder heads and gaskets to glide into position with perfect alignment. Every stud is marked with the ARP stamp as assurance of quality and adherence to ARP's "zero defect, zero failure" standard.

Installation Note: Studs should be installed finger-tight in a relaxed mode, never cranked in tightly. When applying torque to the nut, the stud stretches only on the vertical axis, providing more accurate clamping force than bolts which experience both torsional and tensile stress during installation. Always re-torque after initial engine run to compensate for head gasket compression.