ARP 254-4315 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 254-4315 is a premium cylinder head stud kit engineered for high-performance and racing applications. This Pro Series kit features ARP's renowned 8740 chrome moly steel construction with 12-point heads, delivering exceptional strength and reliability for demanding engine builds.

Superior Material and Heat Treatment:

• Manufactured from premium grade 8740 chrome moly alloy rated at 200,000 psi tensile strength
• Each stud is vertically heat-treated in precision racks for complete, uniform heat penetration
• Thread rolled after heat-treat for approximately 1000% better fatigue strength compared to pre-heat-treat threading
• Centerless ground to exacting tolerances for near-perfect concentricity and straightness

Performance Features:

• 12-point head design with wide area flange for easy access without valve train removal
• Undercut shorter studs equalize stretch for more consistent clamping force across all fasteners
• Includes hardened, parallel-ground washers for even load distribution and accurate torque readings
• Precision manufacturing ensures cylinder heads and gaskets align perfectly during assembly

Why Choose Studs Over Bolts:

Head studs provide superior clamping accuracy because they stretch only on the vertical axis when torqued, unlike bolts which experience both torsional and tensile forces simultaneously. Studs install finger-tight in a relaxed state, then the nut applies pure tensile load for more consistent and reliable torque values. This design also simplifies engine assembly and disassembly, particularly important for racing applications requiring frequent service.

ARP Pro Series head studs are the choice of professional engine builders across all forms of motorsports, delivering zero-defect quality and unmatched performance for competition powerplants.