ARP LS1 / LS2 Camshaft Retainer Plate Bolt Kit-These high-quality ARP cam bolts have increased preload clamping force to ensure positive timing gear register. Their increased material strength overcomes valvetrain harmonics and stress. These cam bolts have a reduced head size that makes installation and removal easier. They are available in 170,000 psi high-performance kits, and 190,000 psi Pro series kits. Material:Chromemoly. Finish:Black Oxide. Sold as a set of 3.