ARP 2344313 Custom Age Head Stud Kit - 625+ 12-Point

The ARP 2344313 Custom Age 625+ Series Head Stud Kit delivers professional-grade cylinder head clamping force for high-performance and racing applications. Featuring 12-point studs, this kit provides superior strength and reliability compared to conventional head bolts.

Premium Materials and Manufacturing:

• Constructed from premium grade 8740 chrome moly steel alloy rated at 200,000 psi tensile strength
• Custom Age 625+ heat treatment process with vertical rack positioning ensures complete, uniform heat penetration
• Centerless ground after heat treatment for exceptional concentricity and straightness
• Thread rolling performed after heat treatment provides approximately 1000% better fatigue strength than pre-heat-treat threading
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings

Performance Benefits:

• 12-point head design allows for precise torque application and easy re-torquing without valve train removal
• Undercut shorter studs (where applicable) equalize stretch characteristics for more consistent clamping force
• Superior alignment during assembly—cylinder heads and gaskets glide into position due to precise manufacturing tolerances
• Reduced risk of head gasket failure through optimized clamping force distribution
• Studs stretch only on vertical axis during torque application, eliminating torsional stress present with bolts

Why Studs Over Bolts: Head studs provide more accurate and consistent torque loading compared to bolts. While bolts experience both torsional and tensile forces during installation, studs installed finger-tight stretch only vertically when the nut is torqued, resulting in more reliable clamping force. Studs also simplify engine assembly and allow for easier disassembly during routine maintenance or rebuilds.

Installation Note: Studs should be installed finger-tight in a relaxed mode. After initial torquing and engine operation, re-torque fasteners to compensate for head gasket compression.

Trusted by professional engine builders across all forms of motorsports, ARP head studs represent the pinnacle of fastener technology for competition and high-performance street engines.