ARP 154-6021 High Performance Cylinder Head Stud Kit

The ARP 154-6021 cylinder head stud kit delivers the superior clamping force and reliability that serious engine builders demand. Engineered from high-strength 8740 chrome moly steel, these precision-manufactured fasteners provide consistent and accurate torque readings while eliminating the cylinder head movement that can lead to gasket failure.

Why ARP Head Studs Outperform Stock Bolts:

Unlike factory head bolts that twist during installation, ARP head studs remain stationary while the nut does the turning. This provides more accurate and consistent torque loading, better clamping force, and superior gasket sealing. The threads are rolled after heat treatment, providing up to 10 times longer fatigue life compared to cut threads.

Key Features:

• Manufactured from premium 8740 chrome moly steel with tensile strength of 180,000-210,000 psi
• Forged in-house at ARP using only the finest quality materials
• Heat-treated using special vertical racks to ensure complete 360-degree penetration
• Threads rolled after heat-treat for maximum fatigue strength
• Precision CNC-machined to exacting tolerances for perfect fit
• Each fastener proudly stamped with the ARP name as your assurance of quality
• Includes hardened parallel-ground washers for even load distribution

8740 Chrome Moly Material:

ARP 8740 chrome moly is a quench and temper steel that offers excellent toughness and adequate fatigue properties for most high-performance and racing applications. When threads are rolled after heat treatment—standard ARP practice—this material delivers reliable performance with tensile strengths between 180,000 and 210,000 psi. The material provides an ideal balance of strength, durability, and cost-effectiveness for street performance and racing engines.

ARP fasteners have been chosen as original equipment by numerous manufacturers who proudly advertise their products as being equipped with ARP hardware. Professional engine builders and racers worldwide trust ARP for optimum reliability and performance.