ARP 235-4320 Head Stud Kit Chrome Moly Steel - 12-Point 8740

The ARP 235-4320 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—exceeding aerospace quality standards.

Superior Manufacturing Process:

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

Performance Advantages:

• 12-point head design with wide area flange eliminates need for valve train removal during retorquing
• Undercut short studs (where applicable) equalize stretch for more consistent clamping force
• Hardened, parallel-ground washers included for even load distribution and accurate torque readings
• Precise tolerances allow cylinder heads and gaskets to align perfectly during assembly
• Studs provide more accurate torque loading than bolts by eliminating torsional stress

ARP studs are the preferred choice of professional engine builders across all forms of racing. Each stud is marked with the ARP stamp as your assurance of quality and zero-defect manufacturing standards. This kit includes all necessary fasteners and washers for complete cylinder head installation.

Installation Note: Install studs finger-tight in relaxed mode. Apply torque only to the nuts, never force studs in with a jammed nut. Re-torque after initial engine run to compensate for head gasket compression.