ARP 208-4601 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 208-4601 Cylinder Head Stud Kit Chrome Moly is a head stud set (also called a cylinder head stud or head bolt kit) built from 8740 chrome moly alloy steel. This variant has 12-point nuts/heads and undercut studs, and belongs to the ARP High Performance 8740 Series.

Key Features:

• Premium 8740 chrome moly steel construction
• 12-point head design
• Undercut studs to even out stretch between shorter and longer studs, for more consistent clamping force and to compensate for head gasket compression
• Heat-treated, then centerless ground for concentricity and straightness
• Threads rolled after heat treatment for better fatigue strength
• Studs are stamped with the ARP name

Why choose studs over bolts: Studs make assembly easier by keeping the cylinder head and gasket properly aligned, and they give more accurate, consistent torque loading because the stud is not twisted while being tightened. Install each stud finger tight, then torque the nut. Because the head gasket compresses on initial torquing, re-torque the fasteners after the engine has been run.

ARP head stud kits are favored by engine builders for performance and competition use, where reliable clamping force and easy serviceability matter.