ARP 190-4304 High Performance Head Stud Kit Chrome Moly Steel - 8740

The ARP 190-4304 head stud kit delivers professional-grade cylinder head clamping force using premium 8740 chrome moly steel construction. Designed for high-performance and racing applications, this Pro Series kit features 12-point studs rated at 200,000 psi tensile strength—significantly stronger than standard head bolts.

Advanced Manufacturing Process:

• Premium 8740 chrome moly alloy with 200,000 psi tensile strength rating
• Vertical rack heat-treating ensures complete and uniform heat penetration
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolling performed after heat-treat for 10x better fatigue strength
• Cold-forged construction maintains molecular integrity

Performance Benefits:

• 12-point head design with wide-area flange eliminates need for valve train removal during retorquing
• Undercut short studs equalize stretch for more consistent clamping force
• Helps prevent head gasket failure through optimized compression compensation
• Superior alignment during assembly—heads and gaskets glide into position
• Hardened parallel-ground washers included for even load distribution and accurate torque readings

Why Studs Over Bolts:

Head studs provide more accurate and consistent torque loading compared to bolts. While bolts twist during installation (reacting to both rotational and tensile forces), studs stretch only on the vertical axis when the nut is torqued. This results in more uniform clamping pressure across the head gasket surface. Studs also simplify engine assembly by ensuring proper cylinder head and gasket alignment.

Each ARP stud is manufactured to exacting tolerances and stamped with the ARP logo as assurance of quality. This kit meets ARP's zero-defect, zero-failure quality standard and is trusted by professional engine builders across all forms of motorsports.

Note: Re-torque studs after initial engine operation to compensate for head gasket compression.