Look no further for the absolute premium valve locks for your K20 or K24. Manufactured from premium quality heat treated steel and machined to exacting tolerances, Manley locks fit the valve and retainer the way they are supposed to fit! Why use stamped, stock locks with your new aftermarket valves, springs, and retainers when you can use Manley Performance locks? Ours are simply superior in material, tolerance, installed height, and overall quality.