ARP 235-4706 Cylinder Head Stud Kit Chrome Moly Undercut - 8740 12-Point

The ARP 235-4706 Pro Series head stud kit represents the gold standard in cylinder head fastening systems for high-performance and competition engines. Engineered with ARP's exacting standards, these studs deliver superior clamping force and reliability under extreme conditions.

Premium 8740 Chrome Moly Construction:

Each stud is manufactured from premium grade 8740 chrome moly steel, rated at 200,000 psi tensile strength—far superior to aircraft quality materials. The studs undergo vertical rack heat-treating to ensure complete and consistent heat penetration throughout the entire part, resulting in uniform strength characteristics that batch-processed fasteners simply cannot achieve.

Precision Manufacturing Process:

• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treat for approximately 1000% better fatigue strength
• Undercut design on shorter studs equalizes stretch for consistent clamping force
• 12-point heads with wide area flanges allow retorquing without valve train removal
• Cold-forged construction ensures molecular integrity

Superior Installation and Performance:

The precision tolerances achieved through ARP's manufacturing process allow cylinder heads and gaskets to align perfectly during assembly. Unlike bolts, which experience both torsional and tensile stress during installation, studs stretch only along the vertical axis when the nut is torqued, providing more accurate and consistent clamping loads. The undercut design compensates for head gasket compression, helping prevent gasket failures and ensuring optimal engine sealing.

Each kit includes hardened parallel-ground washers for even load distribution and accurate torque readings. All studs are stamped with the ARP logo as assurance of authenticity and quality. Designed for competition use, these fasteners meet ARP's zero-defect, zero-failure quality standard.

Note: Studs should be installed finger-tight in a relaxed mode—never cranked in with a jammed nut. Re-torque after initial engine operation to compensate for head gasket compression.