ARP 12-point cylinder-head stud kit for Chevrolet Gen III/IV LSX small blocks. ARP2000 steel provides a 220,000-psi tensile-strength rating.
 
The studs add head-gasket clamping strength for higher cylinder pressure, and hardened washers spread the load at the head. This LSX kit includes the extra 8mm studs that enter from underneath the cylinder head and extend into the lifter valley.
 
ARP2000 steel. 220,000-psi tensile rating. M11 and M8 studs, 12-point nuts, hardened washers, and Ultra-Torque assembly lubricant included. Part 234-4319.