ARP 134-4301 Cylinder Head Stud Kit Chrome Moly Steel - 8740 12-Point

The ARP 134-4301 is a professional-grade cylinder head stud kit engineered for high-performance and competition applications. Manufactured from premium 8740 chrome moly steel and heat-treated to 200,000 psi tensile strength, these studs deliver exceptional clamping force and reliability under extreme conditions.

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• 12-point head design for precise torque application
• Vertical rack heat-treatment ensures complete and uniform heat penetration
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treat for 10x better fatigue strength
• Undercut short studs equalize stretch for consistent clamping force
• Includes hardened parallel-ground washers for even load distribution

Why Choose Studs Over Bolts:

Head studs provide superior accuracy and consistency compared to bolts because they stretch only on the vertical axis during torque application. Bolts experience both rotational and tensile forces simultaneously, which can lead to inconsistent clamping. Studs also simplify engine assembly by ensuring perfect alignment of cylinder heads and gaskets—critical for racing applications requiring frequent servicing.

Installation Notes:

Install studs finger-tight in a relaxed mode—never crank them in using a jammed nut. Apply torque to the nut only, allowing the stud to stretch uniformly on the vertical axis. Re-torque after initial engine run to compensate for head gasket compression.

ARP's precision manufacturing process ensures gaskets and cylinder heads glide into position with perfect alignment. Each stud is marked with the ARP stamp as your assurance of zero-defect quality and the choice of professional engine builders worldwide.