ARP 234-4727 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 234-4727 is a high-performance cylinder head stud kit engineered for serious engine builders who demand the ultimate in clamping force and reliability. Built from premium 8740 chrome moly steel and rated at 200,000 psi tensile strength, these studs deliver exceptional strength and durability for high-performance and racing applications.

Superior Manufacturing Process:

• Precision heat-treated vertically in special racks to ensure complete and uniform heat penetration throughout each stud
• Centerless ground after heat-treat for exceptional concentricity and straightness, ensuring perfect alignment of gaskets and cylinder heads
• Thread rolled after heat-treat for approximately 1000% better fatigue strength compared to pre-heat-treat threading
• 12-point head design for positive engagement and reduced risk of rounding

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• Undercut shorter studs (where applicable) equalize stretch for more consistent clamping force
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings
• ARP stamped on each stud for authenticity and quality assurance
• Designed to prevent head gasket failures through optimized stretch characteristics

Studs vs. Bolts Advantage:

Head studs provide superior clamping accuracy compared to bolts because they stretch only along the vertical axis when torqued, rather than being twisted during installation. This results in more accurate and consistent torque loading. Studs also simplify engine assembly by ensuring proper alignment of cylinder heads and gaskets. Each stud should be installed finger-tight in a relaxed mode, never cranked in using a jammed nut.

These studs are the choice of professional engine builders across all forms of racing. Re-torque after initial engine run-in to compensate for head gasket compression.