Hamburger's Brand New LS Lifter Valley Cover takes functionality and wraps it up in high-tech, high-class package. This quality cover fits Gen III (Non-DoD) engines, and is milled from a solid block of 6061-T6 aircraft aluminum to tolerances only attainable through CNC machining. The 0.48" thick cover offers outstanding block rigidity, while the precision machined under side provides an excellent seal using the existing factory o-ring. The wide chamfered edges ensure adequate intake manifold runner clearance. Finished with a Hard Red anodizing, the cover will really stand out when used on Carbureted LS engines.