ARP 230-4202 Custom Age Head Stud Kit - 625+ 12-Point

The ARP 230-4202 is a premium head stud kit featuring Custom Age 625+ series material with 12-point heads, engineered for high-performance and competition engines requiring maximum clamping force and reliability.

Material and Heat Treatment:

• Custom Age 625+ alloy for superior strength and durability
• Precision heat-treated to exacting standards for complete penetration
• Thread-rolled after heat treatment for 10 times better fatigue strength
• Centerless ground to ensure exceptional concentricity and straightness

Design Features:

• 12-point head design for easy installation and precise torque application
• Undercut shorter studs equalize stretch for consistent clamping force
• Manufactured to exacting tolerances for perfect gasket and head alignment
• Includes hardened parallel-ground washers for even load distribution

Performance Benefits:

• Superior clamping force helps prevent head gasket failure
• Studs stretch only on vertical axis for more accurate torque readings
• Easier engine assembly with assured component alignment
• Preferred by professional engine builders for competition applications

ARP head studs are installed finger-tight in a relaxed mode, then torqued via the nut. This method eliminates the twisting forces present when using bolts, resulting in more consistent and reliable clamping. The undercut design on shorter studs compensates for head gasket compression, ensuring optimal sealing throughout the engine's operating life.

Note: Re-torque after initial engine break-in to compensate for gasket compression.