ARP 235-4401 Pro Series Cylinder Head Stud Kit Chrome Moly - 8740

The ARP 235-4401 Pro Series Head Stud Kit represents the gold standard in cylinder head fastening technology for high-performance and competition engines. Manufactured from premium grade 8740 chrome moly steel and heat-treated to 200,000 psi, these studs deliver exceptional strength and reliability that professional engine builders trust.

Superior Manufacturing Process:

• Premium 8740 chrome moly alloy rated superior to aircraft quality
• Vertical rack heat-treating to 200,000 psi ensures complete, uniform 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
• Specially undercut shorter studs equalize stretch for consistent clamping force

Key Benefits:

• Precise tolerances allow cylinder heads and gaskets to glide into perfect alignment
• Hex head design provides secure, reliable fastening
• Undercut design compensates for head gasket compression to prevent gasket failure
• Studs provide more accurate torque loading than bolts by eliminating torsional stress during installation
• Hardened parallel-ground washers included for even load distribution

Installation Advantage: Unlike bolts that experience both torsional and tensile stress during installation, studs are installed finger-tight and stretch only along the vertical axis when torque is applied to the nut. This results in more consistent and predictable clamping forces, crucial for maintaining head gasket integrity in high-performance applications.

Each stud is marked with the ARP stamp as assurance of quality. Kit comes complete with hardened parallel-ground washers. Re-torque after initial engine run-in to compensate for gasket compression.